R E S U L T S

I RVAT ASTRONOM CAL OBSE IONS,

MADE A T

THE OBSERVATORY OF THE I E UN V RSITY,

D U R H A M ,

N 184-6 TO UL 1848 FROMJA UARY, , J Y, ,

UN DEB THE DI RECTI O N O F

L B . . H E V . L L F T R . R E D . s TE M P E C H EV A I ER, , A _

PRO F B SO B O E A N D A STRO N O I Y I N THE UN I V ERS I TY O F DURHA M .

R EV . N H N B . A . THE ROBERTA CHORT OMPSO ,

O BS ERV ER I N THE UN I V ERS I TY.

D U R H A M

PRIN D P HUMBLE. TED BY THE E! EC UTO RS O F E W . .

IN TRODUCTION .

HE servat r of the niversi of Durham was built in 1841 rin T Ob oy U t , ci all y p p y h ubscri tion . The servati ns un er t e eneral su erint n byprivate s p Ob o , d g p e den ce of the r fess r of at ematics and str n m are c n uc e an O server P o o M h A oo y, od tdby b ,

Th f ll win a es c ntain the results resident at the Observatory . e oo gpg o of O bser

ns ma e et ween anuar 1846 and ul 1848 . vatio d b J y, , J y,

i n Lon i ude o the O bservator La t tude a d t . I . g f y The latit ude was determined in the year 1843 from a large number of direct

d refle te servati ns of a 3 and a rsae in ris and f un to be an c dOb o , U M o , o d

h r en taken 6 f s rva r as i e e as m . 18s . es The longitude o the Ob e toy hth tob W t .

is value was taine as sumin the l n itu e of ur am athe ral as Th ob dby g og d D h C d ,

v n in a eneral surve to be 6m . l 6s . and measurin ri n me ricall the i e y, , gt goo t y g g

a difference of longitude of the O bservatory and the C thedral . Thatdifference

in time and the resul in l n i u e of the serva r 6m . is , t gogtd Ob toy,

. k n . th earest w le num er of sec n s 6m . 18s was a e e n ho b od , , t

I n r er to c rrect t is a r imate value of the l n i u e the meri ian oh od o h ppox ogtd , d servations of the moon made on the same nights at Durham and at Greenwich

av e een c m are and the l n i u e e uce fr m em in the f ll win h b o p d, o td dd d o th oo g g

m anner .

cl ck err r has een f un means of the n - ulminatin ars and A o o b o d, by Moo C gSt , ’ as sum other stars lying near the Moon s parallel. The ed places of the stars are those deduced from the whole of the Observations made at Greenwichdurin g

s has een so serve less han re M s it eac ear. h en an tar e e s Ri hy W b ob d t th , ght y

scensi n has in eneral een r u u fr m the reenwic a al A o , g , b boght p o G h C t ogue of

1439 stars . The places of stars contained in the N autical Almanac have been

’ aken as as sum at reen The i scensi ns of the t ed G wich . Rght A o Moon s Limbs

at the reenwic Transi s are h se iv en the reen wic O serva i ns in G h t to g by G h b to ,

e en en l of t - ul n the dp d ty h Moon C minatingSta rs . The motio of Moon in one “ e hour of longitude has been interpolated from the N autical Alman ac ; the longi

u e of ur am is n td D h then fou dby a simple proportion .

4 01 9 3 6 iv ( . )

The Durham Observations up to the end of 1845 were made by the late O b

s B eanlands se in 1846 m self. erver M r. , , tho by y The re sults are as follows

- ' Du m a s non or Lo nol runn o r G nanxw rc n A N D De a nn a.

J an . 1

M ar. 29

’ O bservations of the M oon s 2nd Limb .

Th f all the resul s ‘ ivin e ual wei ts to eac c m arison is 6m e mean o t , g g q gh h o p ,

' the serva i ns fr m 1842 to 1845 ive 6m . 19 00s . t se of 1846 Ob to o g , ho , 6m . 19 228 .

The Transit nstrument ulle has a f cal len t of 4 ft . 2 in . the dia I , byT y, o g h ,

h las s in The m n meter of t e object g be g 3§ inches . agnifyi gpower of the e e y

piece used is about 100.

The eclinati n ircle is imms . I t is 2 feet in iameter and is D o C byS d , inde ’ pendentlydivided to 5 of arc . It is readby two microscopes at the extremities

of the horizontal axis .

’ The l ck is a v er e cellent one ar furnis e wit . C o y x by H dy, hd h Hardy s escape

ment .

The uat real is Utzscheider and raun f r Eq o by F ho e . I ts focal length is 8 feet 3 inc es and the a erture of its ect las s 6 in h , p obj g ; ches . ( V

The Observatory is indebtedto the munificence of the late Duke of N orth

l ss f n 5in . i . f l en an umberland for a sec n ua rea o 7ft . 4 ca l t d odEq to , byRo , o g h, aperture ; but no Observations withthis instrument are contained in the re p

sent series .

The ransit lock c an be ear and seen fr m the me of the uat real T C h d o Do Eq o ,

i s and is eref re em l e w is n rumen . , th o , poyd thth I t t

I Tra t O bs ati I I . nsi erv ons .

The general m ethod of observing is totake the second from the clock face and reserve the c untin till the ransi is c m lete w en it is v erifie p o g T t o p d, h dby l ooking at the clock .

revi usl e ruar 18 18 the ransi I ns rument carrie five vertical P o ytoFb y, , T t t d wires at the f cus of the e e - iece calle w en the I llumina e o p , d A, B, C, D, E, h td y

nd of the elesc e is as and the s ar se e rve a ve the le . new T op E t, t ob d bo Po A ’ ’ s s em of wires was en su s i u ed and two a i i nal wires were in yt th bttt , ddto B , D ,

s rted etween the mi dle wire and the two ad acent ir s e b d j w e .

F or the c rrec i n of im erfec Transi s the in ervals of the wires fr m the o to p t t , t o m ean of all were e ermine in anuar 1845 fr m wen c m le e ransi s dt d J y, , o t ty o p t T t

1 n l is serve e ween N ov . 1 1843 a d une 3 844 of ar 1 . The values Po , ob dbt , , J ,

en f un were em l e for O serva i ns m a e u ecem er 29 1846 th o d poyd b to d p toD b , , when a new set cam e into use determined from twelve complete Transits of

laris serve e w en m 8 1846 nd 18 e e e er 2 a e ruar 12 4 . The Po , ob dbt Spt b , , Fb y , 7 two sets are as follows

N or rno n THE I TERVAL EACHWIRE MEAN . For an Equatoreal star

1845. 1847 .

A 37 ‘ 499 375 14 B 18 696 j: 187 28 C O ° Ol4 00 18 D 18 798 E 37 ‘ 435 37 ‘ 425

For the new s stem of wires the in ervals fr m the mean r y , t o we e determined in

ril 1848 m eans of ten c m le e ransi s of laris n Ap , , by o p t T t Po , exte ding from

Fe ruar 23 ril 14 and f un to b y , to Ap , o d be For an Equatoreal star

18 715 93 74 0 024 G 93 64 U 18 720 M ( vi- l

ese alues were em l e for servati ns from Februar 1848 . The in Th p o d Ob o y, v y 3 rsa in and 51 v tervals were c m ute in e en en l for laris oris He . o p d dp d ty Po , U M , ( )

The et ds f ulati n the same as t se e lain Cephei. m ho o calc o and use are ho xp ed in the intr ucti ns to he v lumes of reenwic O bservd ion s the fact r od o t o G h , o

60 ! 60

ein em l e for im erfect ransi s of the Sun and enus and the fact r b g poyd p T t V , o

’ 360 sin n s e centric Z . D . 0 I . Moo go x secant n 3 Moo geco . decli nati on W m s apparem y for those of the Moon . From the kn own distances of the wires from the mean a table is computed for all the combinations which can be formed of th e quantity

Sum of the distances of omitted wires from the mean which ives a number to be multipliedby the secant of declination of the ob g served stars . a lane ave een serve one lim has enerall When both limbs of P th b ob d, b g y

wires and the er at two or one at f ur and the t e been observed at three , oth , o oh r

s s t lim s ave een serve at all the s at three but in some ca e boh b h b ob d wire . ,

c IN STRU M E N TAL C onnn rrons .

vi usl to ct er 1846 are su ect to s me The Observations made pre o y O ob , bj o un

n he uncertaint a eare to be c nsi era le ave een alto e on nights whe t y pp d o d b , h b g ther rejected or only suchparticular observations retain ed as could be corrected ,

arl the same na n by means of fundamental stars of ne y decli tio . O n a few

are menti ne un er the star N o . 65 of the atal ue nights three of which o d d , , C o , , g n f un fr m the ransits t emselves a met w the correction has bee o d o T h , hod hich appears to b e applicable for finding the errors of Collimation and Azimuth

are laris a r u of stars near h when the stars employed Po , g op t e zenith and a

rs N o servati ns of the n group of low southern sta . ob o Moo have been omitted but a list is given of all observedRight Ascensions of the Moon and Moon

6 1846 f un t at the screws of the frame whic carries the O u October , , I o d h h

fi e The err r of llimati n has e wires could be more firmly xd . o Co o since that tim

n v r s d var in wit in the foll win limits bee e y tea y, y g h o g ( Vii )

N o. of

lluminate End East I d . “ions.

3. c. 1 nd 0 592 4 6 1846 to Jan . 29 1847 0 5 9 a O ct . , , 27 1847 0- 146 0- 181 3 9 184 . . A . J n . 7 a 2 , p , 2 1848 0- 183 0 235 6 Jan . 1 A . 7 1847 p 2 , ,

1848 81 1848 0- 048 0- 099 4 Jan . 12, ,

The correction is expressed in decimals of a second of time . The change on

ril 2 1847 was the result of a l w iven to the e e- iece on as il cl sin Ap 7, , bo g y p h ty o g the shutters in a hurricane of wind . The Observations for fin din g the error of collimation are made by means of a

u l - ma nameter e e- iece and N rt and ut marks lac e in the dob e I ge Dy p o h So h , p d y

i of Lenses fixe in the skirtin walls of the servat r Th rincipal foc d g Ob oy . e p value of a Rev olution of the Dynameter screw in arc is determined from the

s A s the ele in ointin to t known intervals of the wire . T scope p g he marks is de ° resse 15 fr m the riz ntal a c rrecti n p d o ho o , o o ° 1 5 ! c an e of Level in reversi n of ins trum ent i sin . h g o is taken int acc unt wi the r er si n the collimati n for the mean o o , th pop g ; o of the wires is t en e uce fr m t a for the mi dle wire the si n of the h dd d o ht d , g difference varyin g accordin g to circumstances ; and the result is finally combined with the ' n correction 0013 for diurnal aberratio . The in strument has always been subj ect to considerable variations of level and azimut t u to a less am unt in the later servati ns B ut the effect of h, ho gh o ob o t ese err rs is inc nsi era le r vi e t e remain ste a thr u ut the same h o o d b , po ddhy dy ogho

r u of servati ns and t ere be means of eterminin the azim al op Ob o , h d g uth error g

from da to da as is enerall the cas e . , g y y y

en this err r is f un in the usual manner from the servati ns an er. Wh o o d Ob o , roucous level error has no effect in the determin ation of differences of Right A s

sm ll one w ic ma arise fr m - ensions exce t a ver a an errone us l ck rat . c , p y h h y o o c o e ’ l v l err r b e alt et er ne lecte t en a ein he f l I f the e e o og h g d, h b g t a se azimuthal error so f un I and a the true err rs of level and azimut in n o d, o h u its each of which is ” 15 of are ; a the latitude ; it is found that

' a a 1 tan. A and t e le effect of the two err rs on the ransit of a star h who o t , declination d is ,

cos a — d sin a — . ) . ( d) 1 a . ), s d co . cos. d

t sin a d ’ . ( ) a h e!! ,

cos . a cos. d ( viii. )

’ w en the fact r of a is the same as t at of a and the te . h o h , rm 18 inde en p dent of the Declination . Consequently the error arising from neglectin g the correction for level is eli , minuted on applying the clock errors B ut to find the true clock error it is ne cessar to take account of the term y

The c rrecti n for level has wever een f un fre uent servati ns o o , ho , b o dby q ob o ,

mine means f a s and a lie in the usual manner. is eter o iri level pp d It d dby p t ,

i a rr ction for t in plac ed upon th e pivots . I t s combined with co e he equality of

° ll the ra ii of the iv s am untin to 0 14 ascertaine fr m a c nsi era le num a d p ot , o g d o o d b ber of servati ns of the level err r m a e imme ia el ef re and af er the re ob o o , d d t yb o t v i n f th l s ers o o e Te e cope . The azimuthal error is determined in most cas es either from one observation of laris c m ine wi two or ree servati ns of t er ars or fr m com Po o b d th th ob o oh St , o h bined servati ns of 3 rsae in ris and 51 Hev . e ei ma e at t e same ob o U M o ( ) C ph , d

e Th stars selecte f r t is ur se are se serve as near ssi tim . e d o h p po tho ob d as po

l h s ti ns f ni t servati n s ma e in the da time b e to t e ob erva o o each gh . Ob o d are y consequently subj ect to un certainty on account of the unsteadiness of the instru

lies s ment in level and azimuth . This remark app e peciallytoobservations of

the Sun .

K RR B I CLOC E O .

The places of the fun damental stars have been taken without correction from the N autical Almanac for eachyear. The observations of these stars are not contained in the catalogue .

The cl k oc has generally a small losing rate.

OTHER CORREC TION S .

The Reduction of the apparent Right Ascension at the time of observation to

th e mean i t scensi n for Jan . 0 rece in has een ma e the f rmula Rgh A o , p d g, b d by o A a B b C c D d

e l ari ms of D ein taken fr m the N autical Almanac t se of th o th A, B, C, b g o , ho g a b c d fi°om the ritis ss cia i n a al ue but w en the star is not in , , , B h A o to C t og ; h

in t at atal ue the latter uantities ave eit er een f rme in cluded h C og , q h h b o dby

n fr s f stars v er near t em or c m ute the a riate ter olatio om tho e o y h , o p dby pprop p formulae. : Wh en the Sun n or lane s ave een serve at one Lim nl the , Moo , P t h b ob d bo y, semidiameter has in all cas es een taken fr m the N autical Almanac in de , , b o , ducing the Right Ascension of the Centre . en lim s of the on are serve the c rrecti n for efect of illu Wh both b Mo ob d, o o d

' min t i vers n 0. w 0 a ion s semidiam . x i here is the excess or defect of the difler

ence of s n f h h at the time of the Right A censio o t e Sun and Moon from 12 . ’ ’ n s ransit e resse in a rc and multi lie the c sine of the un s de Moo T xp d , p dby o S

clination

N o correction for defect of illumination has been applied to the meridian

serva i ns f t a s ob to o he Pl net .

V ircle at . I . C O bserv ions

I n the earl l s e and a ypart of 1846 there were two horizonta wire ; 8. fix d m vea le wir s ati k in he o wires cl se o b e. Ob erv ons were then made by eep g t tw o

et er and uc in the l s it the an ll the ect m ve be tog h , to h g Te e cope w h h d ti obj o d

l ken and tween em . I n the urs of t at ear the m vea e wire was r th co e h y o b bo , the ect serve w s ntl ma e to run al n the remainin wire obj ob d as ubseque y d og g .

' I n Feb . 1848 the m veable wire was reinstate M r. imms and the ob , , o dby S , ’ servations v h ircl is rea to 5 s ha e since been made as at first . T e C e d by mean of a inter the remainin minut s d n s micr meters of t s l po , g e an seco d by o he u ua c ns o truction . The error of Runs appears to remain nearly constant in bothpositions of the ” ’ in s rument ein a u 4 5 for 5 w en the illuminate end is est and t , b g bot h d W nearl insensi le w en it is ast I t is serve at least aflzer eac rev ersi n y b h E . ob d h o . ’ The Be n- ac i ns are c m ute essel s efracti n a les iven in the to o p dbyB R o Tb , g Appendix to the GreenwichObservations for 1836 The internal Temperature is assume to t e The e e is d be h same as the external. Th rmom ter fixed to the

wall of the servat r cl se to the N rt ern s utter. Ob oy, o o h h ° ’ ” The latitude assumed in the computations is 54 46 6 The Equatoreal or Polar Poin t of the circle is determinedbyobservation of the fimdamental stars of the N autical lm anac w ence the laces are aken in A , h p t

fl i n av een eac ear wit u c i n N o servati ns e ect e ma e. hy , hot orrect o . ob o byR o h b d The Reduction of the apparent N orth Polar Distance of stars at the time of

servati n to the mean N rt lar istance for Jan . 0 recedin has ob o o h Po D , p g, been made in the same mann er as that of Right Ascension ’ The N orth Polar Distances of the Moon s centre have been deduced from * servati ns of the ri t lim nl . I n servin lane s the N rt or ob o b gh bo y ob g P t , o h

I n a few i v w nstances when the obser ation as not made at the middle wire, a correction has been ’ lied for the M oon s motion in th in rval d ndin on the horar v in app e te , epe g y variation gi en the N au tical lmanac but in one l A or two of the ear y observations, which were made under these circum stances I omitted to notice t di o r ff , he time, and there are no means of sc vering which esults are a ect

ed with this error. ( in )

' ’ ut lim has een taken in arallax of the n s lim has so h b b difierentl . The P Moo b y

een c m ute the f — x z ntal s nds f P l . s n s ri b o p dby ormula lo . eco o og eco d of ho o g ‘ l l - e uat rea P o . sin . z 5 q o + g en . dist . 9 9990 00 (

! lo . f P l “ f o hor. o g ( ) o . ( g a? the horizontal equatoreal parallaxbeing interpolate d with second differences from th au m e N tical lmanac . For the aralla of th lane s the f rmula e A P x e P t , o — ‘ - : l s . is lo . o . sin . z . dis . i l z en t O . lo . poyed g P ( A . d t g g ’ The Moon s semidiam ter used in deducing the N orth Polar Distance of the

— iz n entre e en s u n the ex ressi n z lo . semidiam . lo . e uat real r C , dp d po p o g g q o ho o

‘ 3680 l x m ters f the Pla 9 435 ofhor. P T mi ia e o tal P og. ( he se d

nets are taken from the N autical Almanac .

V . O bservations with the Equatoreal.

’ The observations of the M O O N s DIAM ETER are m ade with a Wire M icrome

ter the wires ein set in the i f t e eridian m vin em ill the , b g d rection o h M by o gth t

N orth or South Limb of the Moon moved alon a transv erse wire . g

’ The Eclipses of JurI TER s SATELLITES and O c c uLTA TI O N s of Stars by the ’ o n were serve wit a ams en s E e- iece ma nif in wer a ut 70. Mo , ob d h R d p , g y gpo bo y

The observations of N EPTU N E and FLORA were made with the Wire Micro

is ins i rom orometer. Th trument is furnished with two wires moveable by M c e

ter crews and t ree fi e wires tran sverse to the f rmer I n 1846 t ere was S , h xd o . h but one fixed wire : the observations of Right Ascens ion and N orth Polar Dis

tance were t eref re made se aratel the wires ein t urne roun t r u , h o , p y, b g d d hogh ° 90 e n t em . M r imm s twee ur a i n e . b h Fo dd tio al wires were then insert dby S ,

but too close to be all em l e and two of em were s rtl afterwar s f un poyd, th ho y d o d k n I t is n m to be bro e . ow customary to use two or sometim es all the three re ain

is n ac of the s i s wire . d ta t . E h crews has a run amoun ting to about loose from t B ut it is found that any error from this source is av oidedby t urning them ai

s ia e sam ire cti ns is t The diiference wa th e d o to b ec the objects to be observed . y of N orth Polar Distance O f two Objects is foundby adding together the two

screw readin s and su tractin the sum of the readin s w en the wires turne g , b g g h d

ns av e een r u t ust to c in T is Zer oint re in the same directio h b boghj o cide . h op

mains constant or ver nea l so. The num er of w l lutions is rea , y r y b ho e Revo d

u n an n x e po I de Plat . ( xi. )

rva i n was n t is met of o se t o owever em lo ed till Dec . 3 184 Th hod b o , h , p y , 7 .

i us servati ns one of the m vea le wires was ke t fixe and I n the prev o Ob o , o b p d, the

Telescope mov edby the Tan gent screw till one object was brought upon it ; the other object was then bisectedby the moveable wire which was brou ht u to g p i n t the fixe wire after eac set of servati ns and th Z coinc de ce wi h d h ob o , e ero O h

e serv d .

- ime to time it is enerall n A s the e e piece is removed from t , g y ecessary to set y s n is is ne turnin ill the wires in position before ob ervi g . Th do by g them t a star

l s moves along one O f the Dec ination wire . The difficulty of set tin g them ex actl appears to be a source of error in the observations of Right A s cension y ,

' n of N rt lar istan is when the difiere ce o h Po D ce considerable .

serve in the sam e assa e t r u the fiel the Both elements are ob d p g hogh d, object

n isecte the m vea le wire as nearl as ssi le to the en r bei gb dby o b y po b C t e . The value of a Rev olution of either screw in arc has been determinedby O h servin dilferences of N orth Polar Distance of known stars in revolutions the g , differences in are beingobtainedby computin g the places of the stars at the

s of servati n fi°om the reenwic atal ue of 1439 stars mean time ob o G h C og , by s of ' ’ ’ ’ of the ri is A ss ciati n a u The s nts a b c d tal e . c rrecti the con ta , B t h o o C og o ons

The resul s of t ese serva for Refraction were applied . t h ob tions are as follows

Dec . 13 125 0

° Dec . 16 5

° Dec . 28 4

The proper motion of the star 57 (a Cassiopea ) given in the Greenwich Cata

logue has been applied . r The mean of all the results is 1 The value has been assumed

all the servati ns c ntaine in this v lum in ob o o d o e . Since the sum of

the screw readin s at the c inci ence of the wires is the same in g o d , whatever part

of th fiel it take lace it f ll ws t at the two screws are e e d p , oo h qual. Observations made for the same purpose by Transits of Polaris were found to

sults give less consistent re . The corrections for Refraction and Parallaxhave been applied to the mean

s se of efracti n ar of eac h set of ob ervations . Tho R o e computedby the formula

- Z ein the er en icular fr m the zenit Z to the meridi ( 0. b g p p d o h an P Sthrou h g the and ect pole P obj S . ) " R 5 x n s . n in P. D . 7 ta . P efractio N . (r G)

The c rrecti ns all ies in the s lar s stem exce t t e o o for Parallax of bod o y , p h

on e en l n . Mo , d p d o the formu a ‘ ar l k uat real riz ntal . a la in N .P. D. x Eq o ho o P P x uat real riz ntal ‘ Parallax in R A . m x Eq o ho o P ’ ’ ’ w ere Z n icular from the e cen ric zeni Z u n PS h , ( Q bein the perpe d g o t th po , g ) ’ ’ k cos . Z Q sin .

5sin N .P. D . I .

a l av nin the values of Q and tan Z Tb es h e been computed contai g P . Q for ° ever 10In of ur an le and ofm and I: for ever 5 of and every 10"I of y ho , y g

rrecti ns are ver readil f un hour angle ; by means of which the co o y y o d . The assumedplaces of the stars of comparison have been derived from the places con

STARS W ITH N EPTU N E .

sume R A . A ssumed N .P. D. As d .

m I . n h . .

- - 5 103. 23. 56 6 B . Jan . 6 50 90 .A C . 7648 0, 184 21 . .

- Jan . 0 1 2 2 . 264 8 102 . 18 . 58 8 , 847 2 .

- - 22 . 28 102 . 40. 47 7

STARS W ITH FLORA .

E och A ssumed B .A . ssume N .P.D . A uthorit p . A d y.

O I I I 11 . m. l .

O Ct . 27 1847 5. 5. 76 . 4 o g x , ppro ,

4 58 . 79 576 . . 13 . 7 1 M “d r - m - - 4 . 43 . 57 40 76 . 0. 81 8 { mgm wg

- 8 5 - 4 . 5. 14 5 5. 2 . 4 7 Dec . 11 2 7 7 , { ammmggm - - Jan . 4 . 11 . 14 56 78 . 51 . 0 5

- - ou 14 48 24 78 . 35. 4 8 M fl w . Jan . 11, 4 . . 6 . 1 1 2 4 . 14

1 72 . 54 . 53 3 4 . 5.

1 . 56 . 59 4. 12 . 7 3

1 . 8 . 5 6 16 . 7 1 0 J n 4 . a . 28, - Green-view s “14mm 6 . . 4 . 19 . 45 7 71 . 9 . 43 8 6 6 9 2 0. 6. 5 4 . 2 . 4 7 2 22

34 . 8 12 69 . 40. 6 4 .

6 . 5 4 5 6 . 3 . 7 . 7 xiii .

When the same star has been observed on several nights its place has been

m ute for eac or i nter late in an emeris for ever ten a s . The co p d h, o d Eph y dy p

’ ’ ’ ’ ’ formula employed are A o B b C o Dd and A o Eh C c Dd when ’ er ses essel s f rmula the star is one of the British Association C at . in oth ca B o

ave een use the uan ti ies h i ein taken fr m the N autical h b d, q t j ; g, G, , H, , b g o m Al anac .

- es r u n and The Double image Micrometer was constructedbyM srs . Toghto

imms I t has een a lie ac r in to the instructi ns iven in the I n r S . b pp d cod g o g to

rva i n s The met of e ual ductions to the Volum es of GreenwichObse to . hod q

istan es h s ll s rv i ns f u l stars s the e e d c a been followed in a the ob e ato o dob e . A y piec e is necessa ril removed from time to tim e the circle reading of the Polar y

alue f a ev luti n Point is found for the Observations of eac h ni ht . The v o R o o g of the Screw has been ascertainedby separating the ima ges of a star and oh

se vi t el to the m an The r ng he tim es of transit across a fixed wire set parall eridi . following are the results of separate determinations

Da of O rvation Tem erature y bse . p .

— 1 5 r n 184 7 Feb . 7 C 10 P ocyo 25 I 3 5 b O rionis 18 42

3 . M ar . 1 7 5 0 rs M U aj . 18 73 June 2 20 5 B e ei 18 60 C ph 1 1 14 5 a e ei 18 43 O ct . C ph M a 6 5 s . 18 5 0U r j .

The first measures were made by separating the images 13' and then 3lr and subtrac ting the less time of transit from the greater to eliminate the zeropoint;

all th e other meas ures were made in a similar manner. I t wouldhave been

etter to se arate the ima es an e ual num er of rev luti ns on site si es b p g q b o o oppo d . The v alue assumed is in all cases The measured equatoreal diameters of Jupiter have been corrected for de

f nat n the uan i se di m sin 0 w en 0is the iff fee o illumi i mi a . ver d er t o by q tty x , h

n n e e ntric n l h e ce betwee th goce a d he iocentric longitudes of t e planet .

Ea la na tion o VI . p f the Printed Res ults .

1 I n the O bservations o Stars the result of eac serv ti n is iven se f , hob a o g pa

r ately .

The name of the star in the ir c lumn is in all cas es ei er the reek let th d o , th G ’ ter Flam steed s nu or m er wit th name of the nstell ti n . , b , h e co a o I n the c lumn N o . o wires w en n o num er is ex resse the servati n o , f , h b p d, ob o

is m lete or fr m Feb . 1848 is ma e at one of the two sets of five e uidis co p , , o , , d q

mean of is sensi l the same as t f ll h s v n w en tant wires . The hat O a t e e e both by , h

The seven c lumn is em l e w en the star has een D . e ceeds the N . P . x th o poyd h b

serve in ifferent ears to fac ilitate the c m aris n of the results wit eac ob d d y , o p o h h other. ’ m M - cul ina ti i ht A scensions o the M oon s Li b and o oon m n Stars . The 2 . R g f , f g

n s f he stars are se of the N autical Almanac . The lac es ere iven am e o t tho p h g ,

n n h im s s n w are th e Apparent Right Asce sio s at t e t e of Ob ervation . I one or t o instances w en ere are no n - culminatin stars er stars l in n ear the , h th Moo g , oth y g

’ Moon s parallel have been inserted .

la n h s a ns O bservations o the San M can and P nets . I t e erv ti of the 3. f , , ob o ’ Sun s diameter the single star implies that one or both limbs has been oh

e at it er ree or f ur wires th e u l star a one or t li s serv d e h th o ; dob e. tht boh mb has been observed at less than three wires ’ I n the lis t of i t scensi ns of the un s entre no servati ns ave Rgh A o S C , Ob o h been inserted except those which are correctedby Clock stars observed either

i r e in o t a f ll win he s rvati n e secon s f he on the n htp ec d g r h t oo g t ob e o . Th d o t g

N autical lmanac ave in all cases een c rrecte for the ti n of the A h , , b o d mo o body

“ 11 urin 6 83 0 05 the as sum n i d g 1 1 ed log tude . ) The Results marked 1' are fi°om Observations by the Professor of M athema n s n m tics a d A troo y . The firstobservations of eachpartic ular kind were made under th e disadvan

ta e O f revi us inex erience . The e u ti ns ave een carefull ma e and g p o p Rd c o h b y d ,

ave een enerall revise but in cer ain cases the a reement of ifferent re h b g y d ; t , d g ault s of the same kin has een i e suffi ent tact of t eir a d b cons d red a ci h c curacy .

The ri inal servati ns t o g Ob o are preserved at the Observa ory .

T' N M N server. ROB A CHORTHO PSO , Ob

O bservator rham A ril 2oth 1849 . y, Du , p , C O N TE N T S .

sA as

I N TRO DU CTI O N

Latitude a nd Longitude

Tra ns it Observations

C orrection of I mp erfect Trans its

I nstrumental Corrections

C ircle Observations

O bserva tions with the Eq uatoreal

Value of M icrometer Screw in A re

Sta rs observed with N ep tune a nd F lora

Exp la nat ion of the Printed Results

n O bserv ed Right Ascensions and N orth Poh r Dista ces of Stars .

- Right Ascensions of the M oon and M oon C ulminating stars .

Horizontal Diameters of the Sun, M oon, and Planets . Ri h g t Ascensions of th e Sun.

Right Ascensions and N orth Polar Distauw s of the M oon and Planets .

’ Transits of the n s Diam r with th E real. M oo ete , e q uato

’ Ecli ses of Ju iter s ll p p Sate ites .

O ccultati n of o s Stars by the M oon .

Ri ht Ascensions and o P D n g N rth olar ista ces of N eptune and Flore .

O bserv o ati ns of Double Stars, and Diameters of Planets.

OBSERVATORY, DURHAM .

O B S E R V A T I O N S O F R I G H T A S C E N S I O N .

O ct . 10

Jan . 11

1847. O ct . 23

184 . O ct . 27 7 2 .

1847 . O ct . 25 3

v Arietis 1847 . O ct . 19

3 Arietis

3. 3 :

o O rioms 1847.

M ar. 4

Dec . 30

5. 1 15 Orionis .

M ar. 5 1 847 . J an . 15

Feb . 11

Jan . 23

Feb . 4 OBSERVATION S OFSTARS .

N O P N N O B S E R V A T I O S O R T H P O L A R D I S T A C E .

o I pl

O ct . 10

Jan . 1 1

O ct . 10

84 1 7 O ct . 19

Feb . 11

- Dec . 8 28 8

Feb . 11 M ° ar. 5 44

° 1847 . Jan . 15 44 81

° Feb . 1 1 24

° M ar. 4 24 23 ° 18 8 132 OBSERVATORY, DURHAM .

B N O P O S E RV AT I O S R IGH T AS C E N S I O N .

M a n ILA .

i ll 1850. J . l , Jen 1 . pre

1846 . Feb . 6

4 M ar.

J . 4 1847 . an 1

8 Feb .

M ar. 5

Fe . 4 1847 . b 2 6 n Geminorum .

° 1846 . M ar. 7 6

M ar. 11

1 Fe 5 847 . b . 2

1847 . Jan. 14

M ar . 7

4 an 5 J . 18 7 . 1 Feb 2 . 6 18 116 9

846 1 .

1847 . Jan . 28

M ar. 7

is n r t 1 . 2358 22 Mooce o 846 M ar . 14

7 .

1846 . M ar 14 1 J 847. an . 28

Feb . 19 18 M ar.

J 1847 . an . 29

1848: Feb . 15 OBSERVATION SOFSTARS .

R O N N R O O B S E V A T I S O F O T HP L A R D I S T A N C E .

o f Seconds

N . P . D. reduced to M enu

reduced to J an . I Jen. , l ,

J an . 1 ,

preceding.

0 l M

n 8 14 9 1 Ja . 2 847 . l 3 ° 8 Feb . 8

N ot good.

° 1847 . Feb . 8

s in the N ot the brightest tar field .

1846 M . ar .

Feb . 8 b ad ob servatmn I ntervals 84 j , 1 7 . am 15

March 19

4 J n . 28 18 7 . a

184 . F b 7 e . 25

1 847 . Jan . 28 O O Feb . 19 C

- i M arc 18 i h i 81

184 7 . Jan . 29 1

1848 . Feb . 16 3 OBSERVATORY, DURHAM .

O B S E R V A T I O N S O F R IGH T A S C E N S I O N .

184 . J 7 an . 14

7

J 1846 . an . 29

M ar . 11 9 1 9 1847 . Jan . 28 6 9 Feb . 8 5 9 1 9

M ar. 20

846 Jan . 29 1 . J 1847 . an . 14

1847 . M ar 18 7

M . 1 Can cri 1846 . ar 7

184 M ar. 17 7 .

M . 1 1848 . ar 9

8 .

1848 . M ar. 29

8 .

1848 . M ar. 29

8 . O BSERVATI ON S OFSTARS .

B R N O S E V A T I O N S O F O R T H P O L A R D I S T A N C E .

0 I I

84 1 1 6 . M ar 1 .

1846 .

184 7 . Jan . 14

Feb . 19

M ar . 19

1847 . Jan . 14

184 7 M ar . 18

1 848 . Feb . O B RV O H M . SE AT RY, DUR A

O B S E R V A T I O N S O F R IGH T A S C E N S I O N .

Seconds of Seconds

M ea n R. A . educed ean R . A . r M . reduced t a Jan. I to J a n. 1 , . Jun. 1 pre 1860. ceding.

s m. s . s. . h

8 4 . 1847 . M ar. 17

8 1 . M 84 ar. 29 April 1 8 6 . .

18 43 . M ar . 29 April 1

1848 . M ar. 29

1848 M ar . . 29 April 1

18 ri 2 Ursa Majoris 48 . Ap l 3

1848 M ar . . 29 April 1

0 Cancri

1848 ril 3 . Ap

8 M ar 1 48 . 29 .

1848 ril 1 . Ap

38 Cancri 1848 . April 1

1848 . M a r. 29

4 n 1848 2 Ca cri . April 1

OBSERVATORY, DURHAM .

O B S E R V A T I O N S O P R IGH T A S C E N S I O N .

N o. of of O servation M ean R . A . , Date b . N ame of Stsr. W ires .

2931 1848 .

M ar . 29 56 2940 9 Hydra 1848 .

0 57 b Cancri Feb . 1

M ar . 9

F eb . 16

58 2970 April 11 i.

dra ril 1 59 2987 14 Hy 1848 . Ap

i 2999 51 Cancr M ar. 29

61 3013

62 3055 Feb . 1 7 April 1 1

63 3058 1848 .

64 3083 April 3

65 3086 Feb . 13

M ar. 12

Feb . 12

66 3093 1848 . 3

67 3104

3133 M ar. 7 4 6

M ar. 29 69 3146 9 Hydra 1848.

9 .

70 3164 9 . OBSERVATION SOFSTARS .

N O P N H N O B S E R V A T I O S O R T P O L A R D I S T A C E .

Date of reduced to Menu Jun 1 1850 Jen. 1 , . , .

6 - 1 848 . Feb . 1 31 2

M ar. 12

Feb .

12 an d ril 3 1846 h as een , Ap , , b s n found from the ob ervations . O

M ar. 12 and ril 3 it a ree Ap , g d 3 44 0 very nearly with thatgiven k er Mar s . Oth servations in 1846 have been re OBSERVATORY, DURHAM .

B N S O S E R V A T I O S O F R IGH T A C E N S I O N .

N ame of Star.

m I . h . .

M ar. 29

Leonis 10 M ar . 29

M ar. 29 07 6

13 Leo . M in.

M ar 2 . 9

6 M ar. 7 ?

M ar . 29

or Le nis o Feb . 10

20 Sextantis O BSERVA TI ON SOFSTARS .

B R N R O S E V A T I O N S O F O T H P O L A R D I S T A N C E .

April 20 - 5 OBSERVATORY, DURHAM .

‘ N N O B S E R V A T I O N S O l R IG H T A S C E S I O .

h . m. s.

ril 0 1846 . Ap 2

1848 . M ar. 29

1848 . M ar . 7

ril 30 1847 . Ap

1848 M ar . 29

1848 . M ar . 29

1847 April 30

1848 . M ar. 29

M 1848 . ar. 15

46 60

1847 April 30 2545

1848 . M ar. 29 2561

v Hydm 1847 April 30

1846 . April 20 31 21

848 . M 1 ar. 29 31 19

1846 ril 21 . Ap 547

1847 . M ar. 22 549

ar. 1848 . M 29 537

° 1848 . M ar. 29 . 2504

50 Leo . M in . 184 ril 0 7 . Ap 3

1848 M ar. 29 OBSERVATION SOFSTARS .

N O P N O B S E R V A T I O S O R T HP O L A R D I S T A N C E .

of Second K t N . P. D re uce to en Dete c . d d

re uce to 1 Jan. 1 mm Observation. d d , , .

Jan . 1 1860.

O I I I 82

M ar 7 bad o servati n . . , b o

84 ril 30 1 7 . Ap

1846 . April 21

1847 . A pril 30

ril 0 1 847 . Ap 3

ril 20 intervals irre 1846 . ril 20 Ap , ular Ap g

54 - ril 38 5 N . of two . 1846 . Ap 20 4 F 423

- 1847 . M ar . 22 2

1847 . April 30

ril 13 1848 . A p OBSERVATORY, DURHAM .

O B S E R V A T I O N S O P R IGH T A S C E N S I O N .

N ame of tar Date of O servation. S . b

. m 3 . h . 1846 April 20

0 3788 x Leonis

3816 66 Leonis 11 .

ril 31 91 1846 . Ap 28 32 14 32 51 1847 M ar . 22 32 24 32 15 31 92 M ar . 29 11 .

1 1 22 114 3836 1846 . 10 90 11 .

6 M ar 2 1 15 38 2 a Leonis . 9

86 116 3 9 71 Leonis M ar. 29

1 17 3886 81 Leonis 46 86 46 99

46 94 1847 M ar. 22 46 70 1848 . M ar. 29 46 77

4 84 . M ar 0 118 389 83 Leonis 1 7 . 3

1 19 3900 1847 . M ar . 29 13 40 o t 13 33 3 25 1848 . “ 1

F 120 3904 M ar. 29 H C 11

121 3925 M ar. 29 1 0

122 3942 M ar. 29

123 3966 4526 45 26 45 38

1848 . M ar. 29 45 22

B E T H M . O S RVA ORY, DUR A

O B S E R V A T I O N S O P R IGH T A S C E N S I O N .

29 rs M ar . x U ae Majoris 1848 .

M ar. 29

r 29 1847 M a .

1847 M ar. 19

M ar . 29

M ar. 29

1848 M ar. 29 1

1846 . 20 88 20 88

1847 . 1 20 89

20 87 12 .

1847 April 23 12 .

1847 M ay 4

1848 April 23 12 .

7 C om e 1848 M ar . 29

12 . 8

M ay 14

1848 M ar. 29 37 13 2 1

1848 M ar. 29 M ay 3

1847 April 23

1847 April 23 O BSERVATION SOFSTARS .

R N O P N O B S E V A T I O S O R T HP O L A R D I S T A N C E .

d d J an 1 ! l w O v tion re uce to . OIN fl . bser a . , J .

Jan . 1 re p ceding.

m 84 . ar r er n . 1 7 M . 30 P op otio in R A in i ' 848 - 1 . N . P. D. o 28 .

18 April 28 8 1 77 M ar. 19 1 84 7 .

18 57 ° 4 46 .

1847 .

98 . O . BSERVATORY, DURHAM

S R A N R S N N O B E V T I O S O F IGH T A C E S I O .

- N ame of Star. Date of C heerration.

s M 71 Ursa Majori ar. 29

1848 . M 2 ar . 9

M ar. 29

17 C om

M ar . 29

8 1 48 . M ar . 29

3 59 18 . 148 4268 7 V irginia 46 3 64 June 3 51 56 3 73 5 3 63 1847 . 54 0

8 1 48 . 57 50

149 4277 1847 . 46 70 4 5594 848 . M 2 9 1 ar. 9 79 49 66 558 1

150 4311 51 17

M ar. 29 60

1848 . M ar . 29

1 52 4329

4340 3 V irginia 1847 .

M ar. 29 2 8 39 8 48 A OBSERV TION SOFSTARS .

R N N R N O B S E V A T I O S O F O T H P O L A R D I S T A C E .

M enu N . P.D reduced to .

Jun. Jan. 1 ,

1 847 .

133 June 3 304 53 7

22

51

ril 28 31 1846 . Ap 2 M ay 8 34 0 278 7

8 0 OBSERVATORY, DURHAM .

N N O B S E R V A T I O N S O P R IGH T A S C E S I O .

8. 11 . m. e.

13 . 0.

ril 28 1846 . Ap

31 17 13 .

59 05 13 .

13 .

13 .

ril 1847 . Ap 28

1846 M a 8 . y 184 ril 28 7. Ap

6 M a 29 14 . 184 . y

14 .

6 184 . M a 2 7 y 14 .

a 6 1847 . M y 2

54 26 OBSERVATION SOF STARS .

N N O B S E R V A T I O S O F O R T HP O L A R D I S T A N C E .

Date of

1846 . 28 1 5

184 7 .

1846 .

ril 28 1847 . Ap OBSERVATORY, DURHAM .

R N O B S E V A T I O N S O F R IGH T A S C E N S I O .

re uced ean B A d M . . , ame of tar N S . to Jun . 1 J 1 , an. , 1850.

1846 .

4894 8 Libra June 6

184 7 .

1848 .

4943 40 B ootis June 13

0 6 une 13 1 5. 498 47 Bootie 184 . J

‘ 5036 1847 . une 21 2008 5B ootis J 15.

June 13 14 95

1 4 56 1847 . June 2 2 42 52

June 1

5094 7 Ursa Minoris June 13

50 8 4 ° 9 18 7 . 31 29 B Corona B or .

51 8 1847 . une 23 7 C r na B or. J Coo

June 1

846 une 1 1 . J

une 23 1847 . J

1847 .

June 25

1 5322 or S erpentis 1847 . June 2

Jnne 24

v S cor n 1 6 ° p 184 7 . June 2 1

OBSERVATORY, DURHAM .

O B S E R V A T I O N S O P R IGH T A S C E N S I O N .

nednu d ean R . A . M , o Jan 1 t . , Jan. 1 , 1am.

6 une 1 184 . J

une 25 1847 . J

June 16

une 21 1847. J

une 21 1847 . J

une 16 1846 . J

84 une 21 1 7. J

1848 .

n Herculis 1847 .

43 91 43 87 44 01

1848.

4 03 3 91 OBSERVATION SOFSTARS .

O B S E R V A T I O N S O F N O R T HP O L A R D I S T A N C E .

Seconds of Seconds

Date of N . P. D . reduced to M ean

O servation reduce to Jan. 1 Jan. 1 1m b . d , , .

Jan. 1 1850.

preceding.

June 1 348

184 7 . June 25 128

July 6 478 58

184 8 . 7 . June 21 08

184 408 35 7 . June 21

883 13 88

June 16 488

645053 7

184 5 7 . June 21 98

1848 - . July 9 9 9 6 53 122 38

762 8 21 8

14 9 37 5 14 5 37 1 29 1 40 4

24 5 46 3 33 1 44 0 OBSERVATORY, DURHAM .

O B S E R V A T I O N S o r R IGH T A S C E N S I O N .

Seco nds of Mea n R A red ced ean R . A . , u M N e o tar Date of O baem tiou. red ced to am f S . r“ 1 1 35 to J . “ 1 0, , J , , Jan . 1 re p 1850 in ced g.

14 86

5781 8 36 41 46 - 70 n O phiuchi 1 47 .

: 1 7 .

184 40 58 5842 68 Herculis 7 .

5860 70 H erculis

5886 g Herculis

5886 9 Herculis 1847 .

June 1

a r ul s 5922 He c i 1847 .

o 18 5976 Serpentis 47 .

5 hi 8 O p uchi 1846 .

1848 . 17

1 Herculis OBSERVA TION SOFSTARS .

N O B S E R V A T I O N S O F O R T H P O L A R D I S T A N C E . O . BSERVATORY, DURHAM

O P N O B S E R V A T I O N S R IGH T A S C E N S I O .

ean B ' A " m of M N a e Star.

h . m. a. 8 7 O phiuchi 1 47 . 1 7

17

65 4

1847.

18 .

0 Herculis 1847 .

18 .

1 8 84 . 18 .

- 41

July 20 7

‘ 0 Serpentis 45 70 45 81

’ 1846 une 30 4 22 0 Serpentis . J 3 7 84 4 26 1 7 . July 7 7 OBSERVATION S OF STARS .

S R P O T D I N O B E V A T I O N S O N R H P O L A R S T A C E .

Date of N .P.D.

O bacrvaticn. n dnced to

- 80. 6 . 4 8

1846 .

” 4 64 57

1084 0 18 0

52 9 A u . 15 bed i n 5 1 ill . 7 g , uminat o

73 2253 1

8353 418 E T OBS RVA ORY, DURHAM .

N O B S E R V A T I O N S O P R IGH T A S C E S I O N .

Seconds

N m e of tar S . 1 to Jan. , Jan. 1 , 1m .

11 . m. 0.

1 ul 848. J y 8 53 33

18 6 une 3 1 8 4 . J 0 0 3 19 80 u 1 1 1 A g. 9 20

1847 . 13 18

8 8 1 4 . July 15 34 23

A 19 19 60 ug .

1847 . A u . 19 22 58 g 19 .

45 50

65 43 Sa ittam e t . 28 1 84 S p 9 . g

4 ) 6623 t C ygm 18 A u 19 33 81 3 47 . g. 786

18 A u . 19 20 31 47. g

1847. 6676 3 V uj peculw ”Cygni 3813? 6 e t . 2 1847 . Sp 9 Cygm M y 28 3232 1261)

6713 x Aquila 1847 .

4 5 184 A u . 24 9 7 7 . g

July 15

184 9 Cy ni 7 . g

E OBS RVATORY, DURHAM .

N N O B S E R V A T I O N S O P R IGH T A S C E S I O .

ean R. A M . M ean B . A . . N ame of Star.

a a itta 1 A . Sg 1846 . u 9 g

1847 . O ct . 18

41 ni 14 Cy e t . g S p

1846 . O ct . 1

4 A uarn 1 q O ct . 27

t 8 Sep . 1 1

’ n 61 Cyg i 21 .

6 e t 28 184 . Sp .

21 .

21 2 0 O ct . 3 . 7 42

1 Sept . 2

O ct . 1

6 O ct . 3 4 28 46 42 21

4537 45 36

O ct . 3 45 32 8 6 45 e t . 1 35 1 47. Sp 21

6 77 6 79

184 . u 9 6 85 7 A g. 6 5 ° Sept . 16 9 6

O ct . 10 21 OBSERVATION SOFSTARS .

B N N O S E R V A T I O S O F O R T H P O L A R D I S T A N C E .

reduced to ean N . P .D M .

O reduced to Jan. 1 Jan. 1 1850 bservation. , , . i 1 Jam 860.

0 I ! I

u 1 145 A g. 9

O ct . 1

u 10 30 A g. 9 8 153 3 40 Sept . 1 7

The largest star in the field a

43 .

0535 2 .

101 583 65

31 O ct . 3 8 105473 18

13 6 115 O ct . 1

15 9 m ti n in Proper o o R A . 14 7 10 7 50 1

r er m ti n in R A 019 178 P op o o .

20 4 15 7 ° in N . 0 5. P. D . 2

O ct . 1 202 2 15

184 e t . 16 13 4 7. S p

r m ti n in A Prope o o R . 263 195

228 100 in N . P. D . 0 04 .

i urr e . O ct . 10 H d E OBS RVATORY, DURHAM .

B O P N N O S E R V A T I O N S R IGH T A S C E S I O .

ean A B ritish A s reduce M B . . , “O servation d N ame cram 11m . . b Jan 1 1 . to Jan. 1 . 850 J l , , an . pre

284 7731 6

285 4 40 uam 77 7 Aq 1847 .

O ct . 8

° 70

O 19 ct . 29

O ct . 1 41 95

e 11 70 Spt . 25 O 11 92 ct . 3

290 945 a e asi e t 16 6 94 7 P g Sp .

O ct . 29 34 67

- 1847. O ct . 11 2

292 8085 O ct . 29

23.

293 8105 TPiscium

1847 . O ct . 21 23.

294 8160 v Pegasi

295 8243

296 8268 Cas siopea 297

298 8368 OBSERVATION SOF STARS .

O F N D O B S E R V A T I O N S O R T H P O L A R I S T A N C E .

Di tt o! N .P. D . Q t utton reduce “ y-m . d

e t . 1847 . S p 22

A u . 1847 . g 7

e 3 S pt . 53 5 0 9

O ct .

5 4 O ct . 29 3

1847 .

O ct .

92 .

O ct .

O ct . 29

2 O ct . 9 39 2 2 2 5

6 29 3 10 9 in R.A . 184 .

106 ° 1847 . O ct . 21 0 04 . in N . . P . D 38 8 6 O ct . 2

1847 . O ct . 21

16 23 3 Sept .

O ct . 30

R O B SERV A TO RY, DU HA M .

OBSERVED RIGHTASCEN SION S OFTHE MOON ’S LIMBS

EN N O N L N A N RIGHTASC SIO SOF M O CU MI TI G STARS,

A T THE TI M ES O F O BSERVA TI O N . OBSERVATORY, DURHAM .

O b Oct O . j . bj ect

h. m. 0. M arch l l

5.

’ ° s 5 o 55 l . 3 y Orioni . Moon I

Moon I 4 .

Moon I 5.

4 4 June 3 Moon I p. Geminorum 0 1 7 Geminorum Moon I

8 Geminorum 4

9 153 3 10

4

n I 8 Moo Sept . 2 3

O ct . 1 3

Moon I

4> Aquam

B O SERVATORY, DURHAM .

O ect O serve A R bj . b d . .

m s 11 . . . 0 n ril n Dec . 2 Moo I Ap 1 1 Moo I

Feb .

Moon I

Moon I O BSERVA TO R Y, DURHA M .

OBSERVED HORIZON TAL DIAMETERS

O F THE

S U N M N A N D P E S , O O , L A N T

S EN S THE SUN RIGHTA C SION OF ,

RIGHTASCEN SION S A N D N ORTH POLAR DISTAN CES

O F THE

ND P E S MOON A LAN T ,

C O M P A R E D W I T H THE N A U T I C A L A L M A N A C . E A AM . OBS RV TORY, DURH

’ THE SU N s M DIA ETER .

ts n Sidereal I ntervals occupiedby i Tra sit compared with those ofthe N autical Alman ac .

&m ma ol

N au ical 0 N . N autical 0 N t 6 . 184 .

A h n mw. .a wa

* O Jan . 1 ct . 23 2UEP88 ZU1 10 27 124fi2 28 131 7 ' * 2* M arch 2 N ov . IN1 83 7 INT14

IDmc . 2 1 1KP18 3 1 5K1 70 7 2l w“) April 281 1 1 21 1MS M ay 12 14 221K} 18 221i ) 29 ifib 21 30 §MI 25

June 1 1847 .

Jan . 13 2 4u1 44 25 26 1 7TH. 29 b 3 Eb . 6 8 141K) 9 fihk 64 10 144K) ZLQ I O 131!i INT64 12 1fii ZLP62 $1 65 $1 32 (590 £1 03 £1 13 £1 32 $1 32 $1 88 TH1 26 INT85 L‘ P14

O ct . 2 TLP90 fU1 12 ILTO4

Im rf d as . pe ect. I N ote bad Z N A L SU N OBSERVED HORI O T DIAMETERSOFTHE , MOON , A N D L N ET P A S .

’ Sidereal I ntervals occupiedby the Tran sit of the Sun s Diameter compared withthos e

O f the N au tical A lmanac .

O bserved O bserved Seconds of

Duration of 0 N . Dura tion of N a utica l O N 8 . 1 847 . 1 48 man Tra nsit . A l ac.

n * M ay Ja . 4

Jun e 1

1 7 - 00 20- 76 O 08 0 18 0 06 0 01 05 July 5 1 7 - 14 O 12 9 - 57 03 s*¢ 9 - 20 9 - 20 00 I 6 ° 72 8 - 80 28 05 0° 16 29* 10

0° 10 April 18 102 3 10- 20

- A ug. 1 1 1 1 52

04 28 23* 05

June 15

O ct . 12 0 12 0 13 0 38 0 03 0 10 2 N ov .

1* Dec . O 12

’ Sidereal I ntervals occupiedby the Transit O f the Moon s Diameter compared with

those of the N autic al Almanac . O BSERVATORY, DURHAM .

u n of the N a tical Alma ac .

O bserved Seco nds of

” 18 Dura tion of an ica O N 4 . 7 1847 ’ Transit Aanine . l ;

- 3 O ct 25 5 v 1 . 1 1 1 0 17 N o . 2 27

28 1 - 72 1 - 32

’ Sidereal Intervals occupiedby the Tran sit O f Jupiter s Diameter compare d with thos e lm of the N autical A anac .

- 0 04. l

’ Sidereal Intervals occupiedby the Transit of Saturn s Diameter compared withthose

n of the N autical Alm a ac .

8 6 . 1 4 1847 . b e t 18 0c 3 QC g Sp 1 Sept . 0 fi 25 1 c O ct . 8 NN 0 P fi 28 ( g 11 N ’ 1 g 21 NO fi 0m NW g 2 v 1 25 0 3 1 w 27 OW g 0 0 NN S 2 1 o 28 eee eee 0 27 1 o 0 8 29 Heee 1 o 1 48 . 8 Jan . 4 e

’ Right Ascensions O f the Sun s Centre .

Seconds 0! — ate of O servation R . A from O servation. N autica o N o D b . b l I N SU N O N A N D L N . OBSERVATO SOFTHE , M O , P A ETS

’ i s si O ue Rght A cen ons f the S un s Centre C ontin d.

Limb Date of O servation R. A from O bservation N antica O N . b . . . l

A lmanac .

11. III . a 6 1 84 .

Jun e 1

July 25

O ct . 2

Dec . 2 E . OBS RVATORY, DURHAM

’ inue d Right Ascension of the Sun s Centre C ont .

Seconds of

O e v on. N autical 0 N . B A . from bs r ati

h. m. I .

21 . 42 .

6 . 21 . 4

March 10

June 24

O ct . 9

Dec . 1

18. 57 .

19. 6 .

OBSERVATORY, DURHAM .

N P D. from Limb . .

O v O servation. bser ed. b

1 I I b m. s

N ov . 27

Feb 22 .

M ar. 29

June 2 1

.

1 98 7 4 1 ° 9 O ct . 2 I m

. N 13 106216644 1162 ov . I I m 56 1 3 ° 2

° I I 4 . 29 . 2 l 69 . 5 m 1 188 Dec . 20 I . 7

J 1 1 4 1 5 s 0 an . I 0 1 1 7 a 1 Feb . I m I TH S A N D I N E UN N L N . OBSERVATO S OF , MOO , P A ETS

D a te of imb from N . P . D from L .

O b serv ation O served O bservation. . b .

s . h . m. 1 848 .

F eb . 16 I N 5 4

1 7 I 19 . Li 1 1 I ar . S 472 15 1 N April 1 1 I N 13 I N

14 I 1 1 . 1 . N 13 8 M ay 13 I N July 13 I N 15

i scensi ns and N r lar istances O f the en Rght A o oth Po D C tre of Venus .

22 .

7 9 6 1 2 4 5 4

97 .

53 48 58 81

M ar . 16 1 . 45 33

23 02

9 . 5.

A ug 3 l 13 5 ° 2 . . 9 78 59 16

O ct . 27 12 .

18 48 .

° 105. 06 3 7 14 2 5 2

Th oes not a ear to be an mistak in th Re ere d pp y e e ductions . OBSERVATORY, DURHAM .

Right Ascensions and N orth Polar Distances of the Centre of Mars .

Seconds of

Date of Limb imb N . P . D from _ L N autica O —N 0 N s l . O s rved O b v ion O bservation . O served O bservation. b e . ser at . b . A lma nac .

b . m . s .

1848 .

an 1 07 7 53 2 J . 1 1 I S 1 69 482 4 7 154 Feb . 1 1 I 0 9 S + 1 0° 77 C 6 2

Right Ascension and N orth Polar Distance of Flora .

s Right Ascensions and N orth Polar Distance of Palla .

Right Ascensions and N orth Polar Distan ces O f Ceres .

s n Right Ascensions an d N orth Polar Di ta ces of th e Centre O f Jupiter.

37 67 O 10 m 4 7 3 27 94 O 02 m 34 8

J— 4 8 m 6 . 8 26 28 0 1 9 wA l 7 I — 6 . c 8 0 12 30 0 06 m 9 t fl 6 wr n 50 8 0 51 49 0 29 M 9 . o O h 0 6 Z 69 . 4 7 5 83 0 20 p s O O

2549 0 14 Z 69. r “O 36 4 0

28 6 3 7 40 67 O 21 m 66 - 46

29 40 O OO i 5525 O 05 m 187 29 O N SUN N A N D L N . BSERVATIO SOFTHE , MOO , P A ETS

Seconds of Seconds of “m P' D ' 0m N autical O N . N autical O N . 0bssrvad gGserve3on . A lmanac A manac . l .

b . m. s .

S 66 40 13 6 1 73 0 7 6 45498 3 0 18 N 3 3 0 09 S 3 3 2 0 S 5 7 4 7 6 46 2708 l S 66 40 171 14 4 2 7

Right Ascensions and N orth Polar Distances of the Centre of Saturn .

1 O ct .

1847 .

- 5 5 S e pt . 3 i 99 5 50 61 2 _

O c t . 8 0 97 1 50 1 49 1 40 1 48 4 6

18 48 .

100. 19 3 5 9

Right Ascension s and N orth Polar Distan ces of Uranus .

Right Ascensions and N orth Polar Distances of N eptune .

46 1 8 . 3 O ct .

1846 —O bservation i s n dark fi eld with illuminated wires. O Y . OBSERVAT R , DURHAM

Ri ht Ascensions and N orth Polar Distan ces of N eptune C oncluded. g

Da te of R . A . from Tabu ar N . P. D. from Tab ular l - 0b E em. s. ph O bs e rv a tio n O bseri atio n. Seco nds O v tion Seconds . . . bser a .

11 . m . s .

18 47 . 2 8 — 3 July 22 2 10 78 20 1 1 O 3 102 . 44 9 57 + u 5 3 0 - 12 102 1 135 1 5 A g. 7 0 ) 5 7 1 2 9 1022 2 12 0 12 5

— O ° 43 102 3 1 2 84 4 4

- O 57 1023 753 8 474 — O ° 53 45 2 24

8 - 1 1 - 63 — O 52 4 15 O ct . 2 2 7

220 2 90 1 30 05 102 . 50. 3O 1 27 5 2 6 10- 44 — 0- 78 41 3 0 7

— o ima one wire onl . A u . . A r x te n at 1847 g 7 pp , see y. Jus v bl . isi e . Sept 2. t d d 18. Ba clou . O c t. , y M . OBSERV A TORY, DUR H A

TR A N S I TS

T H E M ’ S D I M E E R O O N A T .

E OBS RVEDWITH THEEQ UATOREAL. OBSERVATORY, DURHAM .

i Duration of Tra ns t.

D O f O servation ay b .

v io O bser at ns.

— — 1 3 1847 . arc 9 1846 , Feb . 1 1 M h

184 — 7 . April 29 3

— 1846 March 12

—M a 1 2 1 847 . y 9

— - 1846 O ct . 4 10 05

—M a 29 1847 . y

1 — — 847 . O ct . 23 1846 Dec . 2 2 2 2 2

— 1846 M arch 12. I nterru ted b l s p y c oud . 4 h O ct. . Soon t rou h c lo uds . W d v g in ery troublesome . 8 — 18 1 47. Fe b . . U nilluminated Limb not well seen W d ubl . in tro esome.

M arc h 19. U niliuminatc d Limb o t w l n e l seen.

M a 19. Uniilumina ted Limb ust v is i y j ble.

E M OBS RVATORY, DURHA .

E C I P S ES O F J ’ S I S L U P I T ER S A T E L L T E ,

A N D

OCC U LTATI ONS O F STARS

' O O N T H E M . OBSERVATORY, DURHAM .

’ li ses O f u iter s Ec p Jp Satellites .

D3 Of O rvation 3 bse . Siderm l Time .

M ar . 9

M ar. 24

Seen b l a car it. J T on t to cl h g be g ; oudy at total Immersion. OBSERVATORY, DURHAM .

O ccultations O f Stars by the Moon .

1846 —a C om lete li ( ) p ght about fading.

b B elieved to be r I ntinu to w ( ) co rect, but possibly as co ed atch, on account of clouds .

c Possibl too la ( ) y te .

d Extre mel faint in haze os i l nds la ( ) y , p s b y some seco too te .

3 N ear star v er faint near ( ) y the limb, and precise instant lost. ’ Probabl too earl star faint an n d vin (f) y y ; d M oo s e ge wa g . ' 1847. Uncertain to a on g) bout 4 account of clouds . h Uncertain l ( ) , c ouds. i n ( ) Fai t, not exact . — 184 . k N ear clock t d on 8 ( ) ; no hear account of wind.

I N ot seen till some nds fr ( ) seco om the limb .

r ( 171 ) N ot v e y exact ; wind.

n A small star disa ared about ( ) ; ppe from N .

O BSERV A TORY, DUR H A M .

RIGHTASCEN SION S A N D N ORTH POLAR DISTAN CES

O P THE

E S EP U N PLAN T , N T NE A D FLORA ,

E OBSERV D WITH THEEQ U ATOREAL . AM . OBSERVATORY, DURH

lar istan ces of N U N Right Ascensions and N orth Po D EPT E .

N P D tar of Com arison . . . S p .

O I

. . 7648 B . A C .

4 2

N ov .

l03 . 30. l5.8

6 .

1022 4 33 4

5. 5 6

4 . 8 3 Aquam .

4 A u . . 38 and 40 q aru

3 13 83 1023 4 44 2

3 .

VA OBSER TORY, DURHAM .

MEASU RES OF DISTAN CES A N D AN GLESOF POSITION

D U B E S R S O L T A ,

A N D O F

D I A M E T E R S O F P L A N E T S ,

OBSERVED WITH THE EQ UATO REAL A N D DOUBLE—IMAGE E E MICROM T R .