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# ? C! 0 $ 7! = 0 7!  # 0 7! = 0 7!  , , , +/

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\RW - = \RW .1? !\RW )53  LX\ .1? !LX\ )53 !LX\ ?

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) sin H" = cos Lat !sin Dec  sin Lat !cos Dec !cos t ) Lat

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Lat ' v kn cos C T h T h # ! = !! ! 2 !  1 ! "

Lat 2 = Lat 1  # Lat

sin C Lon ' ! = v kn ! T h! T h! # ! cos Lat ! 2  1 "

Lon 2 = Lon 1  # Lon

1kn knot " = 1 nm /h

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# t °! T 1  T 2 * T * h! = T h!  T = 2 2 15 2

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dt tan Lat tan Dec d Dec =  ! d T sin t tan t " dT

@NJ\^[RWP ]QN [J]N XO LQJWPN XO ] JWM 9NL RW J[LVRW^]N\ YN[ QX^[ `N PN]4

tan Lat tan Dec d Dec '! 900 ' /h =  ! sin t tan t " d T h!

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tan Lat  tan Dec d Dec ' ! 900 $ ! tan t d T h!

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]JW .1? − ]JW )53 4 )53 []! ]JW ? ≈ ⋅ 3** 04 []7

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* tan Lat  tan Dec d Dec ' ! t ° !! $ ! 180 900 d T h!

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d Dec ' ! t ' ! $ 3.82 ! tan Lat  tan Dec "! d T h!

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Hc = arcsin sin80 °!sin 1.445 ''  cos80 °!cos1.445 '' !cos 21.7 ' " = 10 ° 0 ' 0.72 ''

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Hc = arcsin sin 45 ° !sin 0.255 ''  cos45 °!cos0.255 '' !cos3.82 '" = 45 ° 0' 0.13 ''

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sin Ho  sin Lat !sin Dec t = " arccos cos Lat !cos Dec

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Lon 1 = t  GHA

Lon 2 = 360 ° t  GHA

If Lon 1 + 180 ° , Lon 1  360 °

If Lon 2 + 180 ° , Lon 2  360 °

If Lon 2 - 180 ° , Lon 2  360 °

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cos Ho dt =  !dH cos Lat !cos Dec !sin t

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cos D = sin Dec M sin Dec B  cos Dec M cos Dec Bcos GHA M ! GHA B"

VY

cos D = sin Dec M sin Dec B  cos Dec M cos Dec Bcos [15  RA M [h ! RA B [h "

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# = Az M ! Az B

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Az M = Az Mapp Az B = Az Bapp

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cos Dapp = sin H Mapp sin H Bapp  cos H Mapp cos H Bapp cos #

cos D ! sin H sin H cos # = app Mapp Bapp cos H Mapp cos H Bapp

AMWMI[QUO [PM WYVKML\YM ^Q[P [PM ZWPMYQKIS [YQIUOSM NVYTML J` [PM aMUQ[P IUL [PM OMVKMU[YQK WVZQ[QVUZ$ ^M OM[2

cos D = sin H M sin H B  cos H M cos H Bcos #

cos D ! sin H sin H cos # = M B cos H M cos H B

/%* BQUKM  QZ KVUZ[IU[$ ^M KIU KVTJQUM JV[P IaQT\[P NVYT\SIZ2 cos D ! sin H sin H cos D ! sin H sin H M B = app Mapp Bapp cos H M cos H B cos H Mapp cos H Bapp

CP\Z$ ^M PI]M MSQTQUI[ML [PM \URUV^U IUOSM & ?V^$ ^M Z\J[YIK[ \UQ[` NYVT JV[P ZQLMZ VN [PM MX\I[QVU2

cos D ! sin H sin H cos D ! sin H sin H M B ! 1 = app Mapp Bapp ! 1 cos H M cos H B cos H Mapp cos H Bapp cos D ! sin H sin H cos H cos H cos D ! sin H sin H cos H cos H M B ! M B = app Mapp Bapp ! Mapp Bapp cos H M cos H B cos H M cos H B cos H Mapp cos H Bapp cos H Mapp cos H Bapp cos D ! sin H sin H ! cos H cos H cos D ! sin H sin H ! cos H cos H M B M B = app Mapp Bapp Mapp Bapp cos H M cos H B cos H Mapp cos H Bapp

DZQUO [PM ILLQ[QVU NVYT\SI NVY KVZQUMZ$ ^M PI]M2

cos D ! cos H ! H " cos D ! cos H ! H " M B = app Mapp Bapp cos H M cos H B cos H Mapp cos H Bapp

BVS]QUO NVY KVZ 8$ ^M VJ[IQU D2-1)./-'30 NVYT\SI NVY KSMIYQUO [PM S\UIY LQZ[IUKM2

cos H M cos H B cos D = [cos D app ! cos H Mapp ! H Bapp "  cos H M ! H B" cos H Mapp cos H Bapp

5LLQUO \UQ[` [V JV[P ZQLMZ VN [PM MX\I[QVU QUZ[MIL VN Z\J[YIK[QUO Q[$ SMILZ [V $.2-(30 NVYT\SI2

cos H M cos H B cos D =  [ cos Dapp  cos H Mapp  H Bapp " ! cos H M  H B" cos H Mapp cos H Bapp

/><354A>5

8MYQ]QUO DC NYVT I S\UIY LQZ[IUKM KVTWYQZMZ [PM NVSSV^QUO Z[MWZ2

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WT D ! WT1 LMapp H LMapp = H1 LMapp  H2 LMapp ! H1 LMapp " WT2 LMapp ! WT1 LMapp

WT D ! WT1 Bapp H Bapp = H1 Bapp  H2 Bapp ! H1 Bapp " WT2 Bapp ! WT1 Bapp

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k tan SD aug = k = 0.2725 1 ! cos H ! k"2 ! sin H sin 2 HP LMapp LMapp [$ M

upper limb: cos H LMapp ! k lower limb: cos H LMapp  k

CPM IS[Q[\LM KVYYMK[QVU QZ2

Lower limb: H Mapp = H LMapp  SD aug

Upper limb: H Mapp = H LMapp ! SD aug

CPM Y\SMZ NVY [PM S\UIY LQZ[IUKM KVYYMK[QVU IYM2

Limb of towards reference body: Dapp = DLapp  SD aug

Limb of moon away from reference body: Dapp = DLapp ! SD aug

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%. EM KVYYMK[ JV[P IS[Q[\LMZ$ ; >IWW IUL ; 6IWW $ NVY I[TVZWPMYQK YMNYIK[QVU$ A&

p[mbar 283 0.97127 0.00137 R [' =   ! i = Mapp , Bapp H % 10 ° i 1010 T [°C  273 tan H 3 i i tan H i "

AQ QZ Z\J[YIK[ML NYVT [PM YMZWMK[Q]M IS[Q[\LM& CPM YMNYIK[QVU NVYT\SI QZ VUS` IKK\YI[M NVY IS[Q[\LMZ IJV]M IWWYV_& )(f& =V^MY IS[Q[\LMZ ZPV\SL JM I]VQLML IU`^I` ZQUKM YMNYIK[QVU TI` JMKVTM MYYI[QK IUL ZQUKM [PM IWWIYMU[ LQZR VN [PM TVVU IUL Z\U! IZZ\TMZ IU V]IS ZPIWM KI\ZML J` IU QUKYMIZQUO LQNNMYMUKM QU YMNYIK[QVU NVY \WWMY IUL SV^MY SQTJ& CPQZ LQZ[VY[QVU ^V\SL INNMK[ [PM ZMTQLQITM[MY ^Q[P YMZWMK[ [V [PM YMNMYMUKM JVL` QU I KVTWSQKI[ML ^I`&

/%, &. EM KVYYMK[ [PM IS[Q[\LMZ NVY [PM WIYISSI_ QU IS[Q[\LM2

sin P M = sin HP M cos H Mapp ! RMapp " sin PB = sin HP Bcos H Bapp ! RBapp "

EM IWWS` [PM IS[Q[\LM KVYYMK[QVUZ IZ NVSSV^Z2

H M = H Mapp ! RMapp  PM H B = H Bapp ! RBapp  PB

CPM KVYYMK[QVU NVY WIYISSI_ QZ UV[ IWWSQML [V [PM IS[Q[\LM VN I NQ_ML Z[IY ;@6 4 (!&

'. EQ[P 8 IWW $ ; >IWW $ ; >$ ; 6IWW $ IUL ; 6$ ^M KISK\SI[M 8 \ZQUO D2-1)./-'30 VY $.2-(30 NVYT\SI&

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D ! D1 T D = T 1  T2 ! T 1 " D2 ! D1

C8 QZ [PM \URUV^U [QTM KVYYMZWVULQUO ^Q[P 8& 8) IUL 8* IYM [IJ\SI[ML S\UIY LQZ[IUKMZ& C) IULC* IYM [PM KVYYMZWVULQUO [QTM DC! ]IS\MZ C * 4 C) # +P!& 8 QZ [PM OMVKMU[YQK S\UIY LQZ[IUKM KISK\SI[ML NYVT 8IWW & 8 PIZ [V JM JM[^MMU 8 ) IUL 8 *&

D ! D2 " D ! D3 " D ! D1 " D ! D3 " D ! D1 " D ! D2" T D = T1   T 2  T 3  D1 ! D2 " D1 ! D3 " D2 ! D1 " D2 ! D3" D3 ! D1 " D3 ! D2 "

T 2 = T 1  3h T 3 = T 2  3h D1 & D2 & D3 or D1 % D2 % D3

8 TI` PI]M IU` ]IS\M JM[^MMU 8 ) IUL 8 +&

CPMYM T\Z[ UV[ JM I TQUQT\T VY TI_QT\T VN 8 QU [PM [QTM QU[MY]IS GC )$ C+H& CPQZ WYVJSMT LVMZ UV[ VKK\Y ^Q[P I WYVWMYS` KPVZMU JVL` PI]QUO I Z\Q[IJSM YI[M VN KPIUOM VN 8& ?MIY I TQUQT\T VY TI_QT\T VN 8$ 8' C ^V\SL JM ]MY` ZTISS$ IUL [PM VJZMY]I[QVU ^V\SL JM MYYI[QK IU`^I`& 5N[MY NQULQUO C 8$ ^M KIU KISK\SI[M [PM ^I[KP MYYVY$ C&

' T = WT D ! T D

C QZ [PM LQNNMYMUKM JM[^MMU V\Y ^I[KP [QTM I[ [PM TVTMU[ VN VJZMY]I[QVU$ EC 8$ IUL [PM [QTM NV\UL J` QU[MYWVSI[QVU$ C8&

B\J[YIK[QUO [PM ^I[KP MYYVY NYVT [PM ^I[KP [QTM$ EC$ YMZ\S[Z QU DC&

UT = WT !' T

/%- -:=>

CPM WYVKML\YMZ LMZKYQJML ZV NIY YMNMY [V I ZWPMYQKIS MIY[P&

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BQUKM [PM KVYYMK[QVUZ IYM ZTISS$ [PM [PYMM ]IS\MZ LV UV[ UMML [V JM ]MY` IKK\YI[M& 9YYVYZ VN I NM^ LMOYMMZ IYM [VSMYIJSM&

@IYISSI_ QU IS[Q[\LM2

CPQZ KVYYMK[QVU QZ IWWSQML [V [PM WIYISSI_ QU IS[Q[\LM IUL QZ \ZML [V KISK\SI[M ;> ^Q[P PQOPMY WYMKQZQVU JMNVYM KSMIYQUO [PM S\UIY LQZ[IUKM&

2 ' PM ( f HP M  [sin 2 Lat "cos Az M sin H Mapp ! sin Lat cos H Mapp

1 N QZ [PM NSI[[MUQUO VN [PM MIY[P2 f = 298.257

PM , improved = P M  ' PM

H M = H mapp ! RMapp  PM , improved

@IYISSI_ QU IaQT\[P2

CPM KVYYMK[QVU NVY [PM WIYISSI_ QU IaQT\[P QZ IWWSQML IN[MY KISK\SI[QUO;> IUL 8& CPM NVSSV^QUO NVYT\SI QZ I NIQYS` IKK\YI[M IWWYV_QTI[QVU VN [PM WIYISSI_ QU IaQT\[P$ 5a >2

sin 2 Lat " sin Az M ' Az M ( f  HP M  cos H M

INNMK[Z 8$ ^M OV JIKR [V [PM KVZQUM NVYT\SI2

cos D = sin H M sin H B  cos H M cos H Bcos #

EM LQNNMYMU[QI[M [PM MX\I[QVU ^Q[P YMZWMK[ [V 2

d cos D" = ! cos H cos H sin # d# M B

d cos D" = ! sin Dd D

! sin Dd D = ! cos H M cos H Bsin #d #

cos H cos H sin # d D = M B d # sin D

/%. BQUKM d # = d Az M $ [PM KPIUOM QU 8 KI\ZML J` IU QUNQUQ[MZQTIS KPIUOM QU 5a > QZ2 cos H cos H sin # d D = M B d Az sin D M

EQ[P I ZTISS J\[ TMIZ\YIJSM KPIUOM QU 5a >$ ^M PI]M2 cos H cos H sin # ' D ( M B ' Az sin D M

Dimproved ( D  ' D

7VTJQUQUO [PM NVYT\SIZ NVY 5a > IUL 8$ ^M OM[2 cos H sin 2 Lat "sin Az sin Az ! Az " D ( D  f HP  B M M B improved M sin D

)33A>13C

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v['' " 692.666 !sin 2 !Lat  1.163 !sin 4!Lat # 0.026 !sin 6!Lat

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v = Lat  Lat '

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/85 )5=94

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ANK MKUIKTZXOI `KTOZN# DI# OY ZNK VUOTZ ]NKXK G YZXGOMNZ ROTK LXUS ZNK KGXZN'Y IKTZKX ZNXU[MN ZNK UHYKX\KX'Y VUYOZOUT OTZKXYKIZY ZNK IKRKYZOGR YVNKXK% ANK GYZXUTUSOIGR `KTOZN# DG# OY ZNK VUOTZ GZ ]NOIN ZNK VR[SH ROTK MUOTM ZNXU[MN ZNK UHYKX\KX'Y VUYOZOUT OTZKXYKIZY ZNK IKRKYZOGR YVNKXK% DG GTJDI GXK UT ZNK YGSK IKRKYZOGR SKXOJOGT% < OY ZNK VXUPKIZKJ MKUIKTZXOI VUYOZOUT UL ZNK SUUT JKLOTKJ H_ 8XKKT]OIN NU[X GTMRK GTJ JKIROTGZOUT%

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CK NG\K ZNXKK YVNKXOIGR ZXOGTMRKY# DGDI<'# DGDI<# GTJ DG<<'% 7OXYZ# ]K IGRI[RGZK `I' LXUS `G'# \# GTJ 3G' [YOTM ZNK :1E =6 3=A9<5A 6=@ A945A YKK INGVZKX ('!1 cos l cos l cos sin l sin cos 180 l zc = za ! v # za ! v!  ° Aa

l arccos cos l cos sin l sin cos l zc =  za ! v  za ! v! Aa

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2 4 2 2 r 1  2e  e !sin Lat 2 r % = = e = 1  p r 1  e2 !sin 2 Lat r2 e & e arcsin sin sin l pc =  %! HP ! zc

9? OY ZNK KW[GZUXOGR NUXO`UTZGR VGXGRRG^% ANK MKUIKTZXOI `KTOZN JOYZGTIK IUXXKIZKJ LUX VGXGRRG^ OY1

l zc = zc  pc

BYOTM ZNK IUYOTK LUXS[RG GMGOT# ]K IGRI[RGZK 3 I# ZNK G`OS[ZN GTMRK UL ZNK SUUT ]OZN XKYVKIZ ZU ZNK MKUIKTZXOI `KTOZN1

cos zl  cos zl !cos v A = arccos a c c sin l sin zc ! v

ANK GYZXUTUSOIGR `KTOZN JOYZGTIK IUXXKIZKJ LUX VGXGRRG^ OY1

arccos cos cos sin sin cos za =  zc ! v # zc ! v! Ac

AN[Y# ZNK >1@1::1F 9< 1:B9BC45 GYZXUTUSOIGR! OY1

l PA = z a  za

ANK YSGRR GTMRK HKZ]KKT < GTJ <'# SKGY[XKJ GZ D G# OY ZNK >1@1::1F 9< 1H9;CB8 # V G` 1

cos p  cos z !cos zl p = arccos c a a az sin sin l z a ! za

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%; * 9676.05983. = %; * 206.05983.  ( %; *

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AU HK IGRI[RGZKJ1

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) 8 0 = ( 7 8 &  0

;UIGR XGJO[Y X K 2 (!1

8 7 ( % = ! ) ) 80 &(0 !IUY )-9 '

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2 r Lat ' = arctan p !tan Lat = arctan [ 1 f 2 !tan Lat [  re

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%!IUY )-9 '!YOT (+ !YOT 9 ' 9 = GXIZGT IUY &0.  %!IUY )-9 '!YOT (+ !IUY 9

9 ' = 9 #' 9

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0$- %5.;?2= "!

,;52=60.7 -=64:9:82?=C

1;8 84EG; 8" 8$:$" 45ABE@4? E89E46GABJ

-52 )/76<@2 ,;52=60.7 -=6.9472

.<>8 4AL GE<4A:?8" 4 FC;8E<64? GE<4A:?8

+ 4=2.? 06=072

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'.B :3 >692>#

sin A1 sin A2 sin A3 = = sin s1 sin s2 sin s3

'.B :3 0:>692> 3:= >612>#

cos s1 = cos s2 cos s3  sin s2 sin s3cos A1

cos s2 = cos s1 cos s3  sin s1 sin s3 cos A2

cos s3 = cos s1 cos s2  sin s1 sin s2cos A3

'.B :3 0:>692> 3:= .9472>#

cos A1 = cos A2cos A3  sin A2 sin A3 cos s1

cos A2 = cos A1cos A3  sin A1sin A3 cos s2

cos A3 = cos A1cos A2  sin A1sin A2 cos s3

&%#& '.B :3 >692> .91 0:>692>#

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'.B :3 0:?.9429?>#

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(.;62='> .9.7:462># s s s s cos 1 2 sin 1 2 A1  A2 A3 2 A1 A2 A3 2 tan tan = tan tan = 2 2 s  s 2 2 s  s cos 1 2 sin 1 2 2 2

s  s A A s s A A tan 1 2 cos 1 2 tan 1 2 sin 1 2 2 2 2 2 = = s A  A s A  A tan 3 cos 1 2 tan 3 sin 1 2 2 2 2 2

&.@>>' 3:=8@7.># A  A s s A  A s  s sin 1 2 cos 1 2 cos 1 2 cos 1 2 2 2 2 2 A = s A = s cos 3 cos 3 sin 3 cos 3 2 2 2 2

A A s s A A s  s sin 1 2 sin 1 2 cos 1 2 sin 1 2 2 2 2 2 A = s A = s cos 3 sin 3 sin 3 sin 3 2 2 2 2

1;8F8 9BE@H?4F 4A7 BG;8EF 78EABJA$

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38 4EE4A:8 G;8 F<78F 9BE@ B9 G;8 E8@4

+66BE7

sin s1 = tan s2tan !90 ° A2 " = cos !90 ° A1"cos !90 ° s3 "

sin s2 = tan !90 ° A1"tan s1 = cos !90 ° s3 "cos !90 ° A2 "

sin !90 ° A1 " = tan !90 ° s3"tan s2 = cos !90 ° A2 "cos s1 sin 90 ° s tan 90 ° A tan 90 ° A cos s cos s ! 3 " = ! 2 " ! 1" = 1  2

sin !90 ° A2 " = tan s1tan !90 ° s3" = cos s2 cos !90 ° A1"

-A 4 F<@C?8E 9BE@" G;8F8 8DH4G

sin s1 = tan s2 cot A2 = sin A1 sin s3

sin s2 = cot A1 tan s1 = sin s3 sin A2

cos A1 = cot s3 tan s2 = sin A2 cos s1 cos s cot A cot A cos s cos s 3 = 2  1 = 1  2

cos A2 = tan s1 cot s3 = cos s2 sin A1

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ENKT [YOTM ZNK OTZKXIKVZ SKZNUJ" ZNK RGZOZ[JK UL ZNK GYY[SKJ VUYOZOUT"

CNK LOXYZ YZKV OY IGRI[RGZOTM ZNK YOJK ` UL ZNK TG\OMGZOUTGR ZXOGTMRK H_ [YOTM ZNK RG] UL IUYOTKY LUX YOJKY0

cos z = cos 90 ° Lat AP !cos 90 ° Dec " sin 90 ° Lat AP !sin 90 ° Dec !cos t

BOTIK IUY /&b#^! KW[GRY YOT ^ GTJ \OIK \KXYG" ZNK KW[GZOUT IGT HK ]XOZZKT OT G YOSVRKX LUXS0

cos z = sin Lat AP !sin Dec " cos Lat AP !cos Dec !cos t

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B[HYZOZ[ZOTM ZNK GRZOZ[JK 9 LUX `" ]K MKZ0

sin H = sin Lat AP !sin Dec " cos Lat AP !cos Dec !cos t

BUR\OTM ZNK KW[GZOUT LUX 9 RKGJY ZU ZNK GRZOZ[JK LUXS[RG QTU]T LXUS INGVZKX *0

H = arcsin sin Lat AP !sin Dec " cos Lat AP !cos Dec !cos t

CNK GRZOZ[JK ZN[Y UHZGOTKJ LUX G MO\KT VUYOZOUT OY IGRRKJ ,647<;.- *3;2;<-. " ', $

''#' CNK G`OS[ZN GTMRK UL ZNK UHYKX\KJ HUJ_ OY GRYU IGRI[RGZKJ H_ SKGTY UL ZNK RG] UL IUYOTKY LUX YOJKY0

cos 90 ° Dec = cos 90 ° Lat AP !cos z " sin 90 ° Lat AP !sin z!cos Az

sin Dec = sin Lat AP !cos z " cos Lat AP !sin z!cos Az

DYOTM ZNK IUSV[ZKJ GRZOZ[JK OTYZKGJ UL ZNK `KTOZN JOYZGTIK XKY[RZY OT ZNK LURRU]OTM KW[GZOUT0

sin Dec = sin Lat AP !sin Hc " cos Lat AP !cos Hc !cos Az

BUR\OTM ZNK KW[GZOUT LUX 4` LOTGRR_ _OKRJY ZNK G`OS[ZN LUXS[RG LXUS INGVZKX *0

sin Dec  sin Lat !sin Hc Az = arccos AP cos Lat AP !cos Hc

CNK GXIIUY L[TIZOUT XKZ[XTY GTMRKY HKZ]KKT &b GTJ '.&b$ CNKXKLUXK" ZNK XKY[RZOTM G`OS[ZN GTMRK OY TUZ TKIKYYGXOR_ OJKTZOIGR ]OZN ZNK ZX[K G`OS[ZN" 4` > &b$$$ ),&b" SKGY[XKJ IRUIQ]OYK LXUS ZX[K TUXZN! IUSSUTR_ [YKJ OT TG\OMGZOUT$ :T GRR IGYKY ]NKXK Z OY TKMGZO\K 8@ KGYZ UL 4@! " 4` > KW[GRY 4`$ ?ZNKX]OYK Z VUYOZO\K" 8@ ]KYZ]GXJ LXUS 4@ GY YNU]T OT %)(! "" " !" 4` > OY UHZGOTKJ H_ Y[HZXGIZOTM 4` LXUS ),&b$

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4MGOT" ZNK RG] UL IUYOTKY LUX YOJKY OY GVVROKJ0

cos z = cos 90 ° Lat AP !cos 90 ° Dec " sin 90 ° Lat AP !sin 90 ° Dec !cos t

sin H = sin Lat AP !sin Dec " cos Lat AP !cos Dec !cos t

sin H  sin Lat !sin Dec cos t = AP cos Lat AP !cos Dec

sin H  sin Lat !sin Dec t = arccos AP cos Lat AP !cos Dec

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''#( CNK LOXYZ XOMNZ ZXOGTMRK OY LUXSKJ H_ @>" F" GTJ 8@" ZNK YKIUTJ UTK H_ 8@" F" GTJ 4@$ CNK *<>232*9? 7*9;: AGTJ; GXK OTZKXSKJOGZK W[GTZOZOKY [YKJ ZU IGRI[RGZK ` UX 9I! GTJ 4`$ ; OY ZNK MKUMXGVNOI RGZOZ[JK UL F$ 5UZN ZXOGTMRKY GXK YUR\KJ [YOTM (*72.9': 9<3.: 6/ ,29,<3*9 7*9;: YKK INGVZKX /!$ %)(! "" $ ORR[YZXGZKY ZNK IUXXKYVUTJOTM IOXI[RGX JOGMXGSY0

4IIUXJOTM ZU >GVOKX'Y X[RKY" 9I GTJ 4` GXK IGRI[RGZKJ H_ SKGTY UL ZNK LURRU]OTM LUXS[RGY0 sin R = sin t !cos Dec # R = arcsin sin t !cos Dec sin Dec sin Dec sin Dec = cos R!sin K # sin K = # K = arcsin cos R cos R B[HYZOZ[ZK '.&b −; LUX ; OT ZNK LURRU]OTM KW[GZOUT OL Z 3 /&b UX /&b 1 <94 1 (-&b!$

sin Hc = cos R !cos K  Lat AP # Hc = arcsin [ cos R!cos K  Lat AP

sin R sin R sin R = cos Hc !sin Az # sin Az = # Az = arcsin cos Hc cos Hc

7UX L[XZNKX IGRI[RGZOUTY" Y[HYZOZ[ZK '.&b −4` LUX 4` OL ; GTJ

''#) CU UHZGOT ZNK ZX[K G`OS[ZN" 4` > &b$$$ ),&b!" ZNK LURRU]OTM X[RKY NG\K ZU HK GVVROKJ0

 Az if Lat AP $ 0  N AND t % 0 180 °% LHA % 360 ° Az N = 360 ° Az if Lat AP $ 0 N AND t $ 0 0°% LHA % 180 ° ° Az Lat S ! 180 " if AP % 0  "

CNK JO\OJKJ TG\OMGZOUTGR ZXOGTMRK OY UL IUTYOJKXGHRK OSVUXZGTIK YOTIK OZ LUXSY ZNK ZNKUXKZOIGR HGIQMXU[TJ LUX G T[SHKX UL :201; 9.-<,;265 ;*+3.: " K$M$" ZNK 4MKZUT CGHRKY YKK HKRU]!$ :Z OY GRYU [YKJ LUX 09.*; ,29,3. 5*=20*;265 INGVZKX '(!$

DYOTM ZNK YKIGTZ GTJ IUYKIGTZ L[TIZOUT YKI ^ 2 '%IUY ^" IYI ^ 2 '%YOT ^!" ]K IGT ]XOZK ZNK KW[GZOUTY LUX ZNK JO\OJKJ TG\OMGZOUTGR ZXOGTMRK OT ZNK LURRU]OTM LUXS0 csc R = csc t !sec Dec

csc Dec csc K = sec R

B[HYZOZ[ZK '.&b −; LUX ; OT ZNK LURRU]OTM KW[GZOUT OL Z 3 /&b0

csc Hc = sec R!sec K  Lat csc R csc Az = sec Hc B[HYZOZ[ZK '.&b −4` LUX 4` OL ; GTJ

:T RUMGXOZNSOI LUXS" ZNKYK KW[GZOUTY GXK YZGZKJ GY0

log csc R = log csc t " log sec Dec

log csc K = log csc Dec  log sec R

log csc Hc = log sec R " log sec K  Lat

log csc Az = log csc R  log sec Hc

EOZN ZNK RUMGXOZNSY UL ZNK YKIGTZY GTJ IUYKIGTZY UL GTMRKY GXXGTMKJ OT ZNK LUXS UL G Y[OZGHRK ZGHRK" ]K IGT YUR\K G YOMNZ H_ G YKW[KTIK UL YOSVRK GJJOZOUTY GTJ Y[HZXGIZOUTY$ 4VGXZ LXUS ZNK ZGHRK OZYKRL" ZNK UTR_ ZUURY XKW[OXKJ GXK G YNKKZ UL VGVKX GTJ G VKTIOR$

CNK 4MKZUT CGHRKY 9$?$ (''!" LOXYZ V[HROYNKJ OT '/)'" GXK HGYKJ [VUT ZNK GHU\K LUXS[RGY GTJ VXU\OJK G \KX_ KLLOIOKTZ GXXGTMKSKTZ UL GTMRKY GTJ ZNKOX RUM YKIGTZY GTJ RUM IUYKIGTZY UT ), VGMKY$ BOTIK GRR IGRI[RGZOUTY GXK HGYKJ UT GHYUR[ZK \GR[KY" IKXZGOT X[RKY OTIR[JKJ OT ZNK OTYZX[IZOUTY NG\K ZU HK UHYKX\KJ$

BOMNZ XKJ[IZOUT ZGHRKY ]KXK JK\KRUVKJ SGT_ _KGXY HKLUXK KRKIZXUTOI IGRI[RGZUXY HKIGSK G\GORGHRK OT UXJKX ZU YOSVROL_ IGRI[RGZOUTY TKIKYYGX_ ZU XKJ[IK G YOMNZ$ BZORR ZUJG_" YOMNZ XKJ[IZOUT ZGHRKY GXK VXKLKXXKJ H_ VKUVRK ]NU JU TUZ ]GTZ ZU JKGR ]OZN ZNK LUXS[RGY UL YVNKXOIGR ZXOMUTUSKZX_$ =UXKU\KX" ZNK_ VXU\OJK G \GR[GHRK HGIQ[V SKZNUJ OL KRKIZXUTOI JK\OIKY LGOR$

C]U SUJOLOKJ \KXYOUTY UL ZNK 4MKZUT CGHRKY GXK G\GORGHRK GZ0 NZZV0%%]]]$IKRTG\$JK%VGMK)$NZS

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8ALE; 4BF> 6:MB@:KBGF

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COL KPZ[HUJL# K_# PZ [OL ]LJ[VY Z\T VM H UVY[O$ZV\[O JVTWVULU[# K

d Lat 1 = d Lon cos Lat tan C

:M [OL KPZ[HUJL IL[^LLU 3 KLMPULK I`

Lat B Lon B d Lat 1 =  d Lon  cos Lat tan C 

Lat A Lon A

Lat B " Lat A " Lon B $ Lon A ln tan ! $ ln tan ! = [ 2 4 # [ 2 4 # tan C

()$( Lon B $ Lon A tan C = Lat B " tan ! 2 4 # ln Lat A " tan ! 2 4 #

=LHZ\YPUN HUNSLZ PU KLNYLLZ HUK ZVS]PUN MVY 5# ^L NL[1

Lon B $ Lon A C = arctan Lat B tan ! 45 ° 2 # ln Lat A tan ! 45 ° 2 #

9A> K>IE 4GF .#4GF - A:J KG ;> BF KA> I:F@> ;>KN>>F Q&*%R K:F= !&*%R$ 3? BK BJ GLKJB=> KABJ I:F@>" N> A:M> KG :== GI JL;KI:?GI> >FK>IBF@ KA> IALE; DBF> ?GIELD:$

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C if Lat B & Lat A AND Lon B & Lon A C % 360 °! C if Lat B & Lat A AND Lon B ' Lon A ° C Lat Lat !180 ! if B ' A "

CV MPUK [OL [V[HS SLUN[O VM [OL YO\TI SPUL [YHJR# ^L JHSJ\SH[L [OL PUMPUP[LZPTHS KPZ[HUJL K_1 d Lat dx = cos C

COL [V[HS SLUN[O K PZ MV\UK [OYV\NO PU[LNYH[PVU1

Lat B 1 Lat B $ Lat A d =  d Lat = cos C  cos C

Lat A

7PUHSS`# ^L NL[1

40031.6 Lat B $ Lat A Lat B $ Lat A d [km =  d [nm =60  360 cos C cos C

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40031.6 d [km =  Lon $ Lon #cos Lat d[nm =60  Lon $ Lon #cos Lat 360 B A B A

()$) 2I>:K /BI 6:MB@:KBGF

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d Lat Lat Lat Lat Lon AB = arccos sin Asin B ! cos Acos Bcos ( AB #

( Lon AB = Lon B $ Lon A

>VY[OLYU SH[P[\KL HUK LHZ[LYU SVUNP[\KL HYL WVZP[P]L# ZV\[OLYU SH[P[\KL HUK ^LZ[LYU SVUNP[\KL ULNH[P]L% 3 NYLH[ JPYJSL KPZ[HUJL OHZ [OL KPTLUZPVU VM HU HUNSL% CV TLHZ\YL P[ PU KPZ[HUJL \UP[Z# ^L T\S[PWS` P[ I` +''*(%-&*-' KPZ[HUJL PU RT! VY I` -' KPZ[HUJL PU UT!%

sin Lat B $ sin Lat Acos d AB CA = arccos cos Lat Asin d AB

:M [OL [LYT ZPU

:U #%$ !"-" # 53 PZ [OL BFBKB:D @I>:K # 54 [OL ?BF:D @I>:K % BPUJL [OL HUNSL IL[^LLU [OL NYLH[ JPYJSL HUK [OL YLZWLJ[P]L SVJHS TLYPKPHU ]HYPLZ HZ ^L WYVNYLZZ HSVUN [OL NYLH[ JPYJSL \USLZZ [OL NYLH[ JPYJSL JVPUJPKLZ ^P[O [OL LX\H[VY VY H TLYPKPHU!# ^L JHU FGK Z[LLY H JVUZ[HU[ JV\YZL HZ ^L ^V\SK ^OLU MVSSV^PUN H YO\TI SPUL%

COLVYL[PJHSS`# ^L OH]L [V HKQ\Z[ [OL JV\YZL JVU[PU\HSS`% COPZ PZ WVZZPISL ^P[O [OL HPK VM UH]PNH[PVU JVTW\[LYZ HUK H\[VWPSV[Z% :M Z\JO TLHUZ HYL UV[ H]HPSHISL# ^L OH]L [V JHSJ\SH[L HU \WKH[LK JV\YZL H[ JLY[HPU PU[LY]HSZ ZLL ILSV^!%

8YLH[ JPYJSL UH]PNH[PVU YLX\PYLZ TVYL JHYLM\S ]V`HNL WSHUUPUN [OHU YO\TI SPUL UH]PNH[PVU% ?U H =LYJH[VY JOHY[ ZLL JOHW[LY (*!# H NYLH[ JPYJSL [YHJR HWWLHYZ HZ H SPUL ILU[ [V^HYKZ [OL LX\H[VY% 3Z H YLZ\S[# [OL UH]PNH[VY TH` ULLK TVYL PUMVYTH[PVU HIV\[ [OL PU[LUKLK NYLH[ JPYJSL [YHJR PU VYKLY [V ]LYPM` PM P[ SLHKZ [OYV\NO UH]PNHISL HYLHZ%

FP[O [OL L_JLW[PVU VM [OL LX\H[VY# L]LY` NYLH[ JPYJSL OHZ [^V M>IKB<>J # [OL WVPU[Z MHY[OLZ[ MYVT [OL LX\H[VY% COL ]LY[PJLZ OH]L [OL ZHTL HIZVS\[L ]HS\L VM SH[P[\KL ^P[O VWWVZP[L ZPNU! I\[ HYL (/'b HWHY[ PU SVUNP[\KL% 3[ LHJO M>IK>O HSZV JHSSLK :H>O !# [OL NYLH[ JPYJSL PZ [HUNLU[ [V H WHYHSSLS VM SH[P[\KL# HUK 5 PZ LP[OLY 0'b VY ).'b JVZ 5 2 '!% CO\Z# ^L OH]L H YPNO[ ZWOLYPJHS [YPHUNSL MVYTLK I` [OL UVY[O WVSL# @ ># [OL ]LY[L_#E# HUK [OL WVPU[ VM KLWHY[\YL# 3 7PN% ()$*!1

()$* CV KLYP]L [OL MVYT\SHZ ULLKLK MVY [OL MVSSV^PUN JHSJ\SH[PVUZ# ^L \ZL >HWPLY'Z Y\SLZ VM JPYJ\SHY WHY[Z 7PN% ()$+!% COL YPNO[ HUNSL PZ H[ [OL IV[[VT VM [OL JPYJ\SHY KPHNYHT% COL MP]L WHY[Z HYL HYYHUNLK JSVJR^PZL%

7PYZ[# ^L ULLK [OL SH[P[\KL VM [OL ]LY[L_#

cos Lat V = sin CAcos Lat A

BVS]PUN MVY

COL HIZVS\[L ]HS\L VM ZPU 53 PZ \ZLK [V THRL Z\YL [OH[

ZUN _! PZ [OL JB@FLE M\UJ[PVU1 $1 if x'0 sgn x# = 0 if x=0 !!1 if x&0 "

:M E PZ SVJH[LK IL[^LLU 3 HUK 4 SPRL ZOV^U PU 7PN% ()$*!# V\Y SH[P[\KL WHZZLZ [OYV\NO HU L_[YLT\T H[ [OL PUZ[HU[ ^L YLHJO E% COPZ KVLZ UV[ OHWWLU PM 4 PZ IL[^LLU 3 HUK E%

()$+ ;UV^PUN HWPLY'Z Y\SLZ1

tan Lat A cos ( Lon = ( Lon AV = ( Lon V $ ( Lon A tan Lat V

BVS]PUN MVY 

COL SVUNP[\KL VM E PZ tan Lat Lon Lon C A V = A ! sgn sin A#arccos tan Lat V

3KK VY Z\I[YHJ[ *-'b PM ULJLZZHY`%!

COL [LYT ZUN ZPU 5 3! PU [OL HIV]L MVYT\SH WYV]PKLZ HU H\[VTH[PJ JVYYLJ[PVU MVY [OL ZPNU VM 

;UV^PUN [OL WVZP[PVU VM E KLMPULK I` HWPLY'Z Y\SLZ VUJL TVYL# ^L NL[1

tan Lat X = cos ( Lon XV tan Lat V ( Lon XV = Lon V $ Lon X Lat Lon Lat X = arctan cos ( XV tan V #

7\Y[OLY# ^L JHU JHSJ\SH[L [OL JV\YZL H[ [OL WVPU[ G1

cos C X = sin ( Lon XV sin Lat V

arccos sin ( Lon sin Lat if sin C & 0 C = XV V # A X Lon Lat ° C ! arccos sin ( XV sin V # ! 180 if sin A' 0 "

3S[LYUH[P]LS`# 5 G JHU IL JHSJ\SH[LK MYVT [OL VISPX\L ZWOLYPJHS [YPHUNSL MVYTLK I` G# @ ># HUK 4%

COL HIV]L MVYT\SHZ LUHISL \Z [V LZ[HISPZO Z\P[HIS` ZWHJLK N:PHGBFKJ VU [OL NYLH[ JPYJSL HUK JVUULJ[ [OLT I` Z[YHPNO[ SPULZ VU [OL =LYJH[VY JOHY[% COL ZLYPLZ VM D>@J [O\Z VI[HPULK# LHJO VUL ILPUN H YO\TI SPUL [YHJR# PZ H WYHJ[PJHS HWWYV_PTH[PVU VM [OL PU[LUKLK NYLH[ JPYJSL [YHJR% 7\Y[OLY# ^L HYL UV^ HISL [V ZLL ILMVYLOHUK PM [OLYL HYL VIZ[HJSLZ PU V\Y ^H`%

5>:F D:KBKL=>

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5V\YZL1 Lon B$ Lon A Lat A ! Lat B C = arctan cos Lat  Lat = M Lat Lat M B$ A # 2

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".'798 '3* %1499/3- &.++98

$+7)'947 ".'798

4N ORDER TO CONSTRUCT A 7ERCATOR CHART" WE HAVE TO REMEMBER HOW THE GRID PRINTED ON A GLOBE LOOKS$ /T THE EQUATOR" AN AREA OF" E$ G$" ( BY ( DEGREES LOOKS ALMOST LIKE A SQUARE" BUT IT APPEARS AS A NARROW TRAPEZOID WHEN WE PLACE IT NEAR ONE OF THE POLES$ >HILE THE DISTANCE BETWEEN TWO ADJACENT PARALLELS OF IS CONSTANT" THE DISTANCE BETWEEN TWO MERIDIANS BECOMES PROGRESSIVELY SMALLER AS THE LATITUDE INCREASES BECAUSE THE MERIDIANS CONVERGE TO THE POLES$ /N AREA WITH THE INFINITESIMAL DIMENSIONS D6AT AND D6ON WOULD APPEAR AS AN OBLONG WITH THE DIMENSIONS DX AND DY ON OUR GLOBE %'& !#-! !-

dx = c' d Lon cos Lat dy = c' d Lat

DX CONTAINS THE FACTOR COS 6AT SINCE THE CIRCUMFERENCE OF A PARALLEL OF LATITUDE IS PROPORTIONAL TO COS 6AT$ =HE CONSTANT C' IS THE SCALE FACTOR OF THE GLOBE MEASURED IN" E$ G$" MM%[!$

d Lat dy = c cos Lat

=HE NEW CONSTANT C IS THE SCALE FACTOR OF THE CHART$ 8OW" DX REMAINS CONSTANT PARALLEL MERIDIANS!" BUT DY IS A FUNCTION OF THE LATITUDE AT WHICH OUR SMALL OBLONG IS LOCATED$ =O OBTAIN THE SMALLEST DISTANCE FROM ANY POINT WITH THE LATITUDE 6AT : TO THE EQUATOR" WE INTEGRATE-

Y Lat P d Lat Lat P " Y = dy = c = c ln tan !   cos Lat 2 4 # 0 0

@ IS THE DISTANCE OF THE RESPECTIVE PARALLEL OF LATITUDE FROM THE EQUATOR$ 4N THE ABOVE EQUATION" ANGLES ARE GIVEN IN CIRCULAR MEASURE RADIANS!$ 4F WE MEASURE ANGLES IN DEGREES" THE EQUATION IS STATED AS-

Lat [° Y = c ln tan P ! 45 ° 2 #

')#' =HE DISTANCE OF ANY POINT FROM THE 3REENWICH 6ON . &[! VARIES PROPORTIONALLY WITH THE OF THE POINT" 6ON :$ ? IS THE DISTANCE OF THE RESPECTIVE MERIDIAN FROM THE 3REENWICH MERIDIAN-

Lon P X = dx = c Lon  P 0

%'& !#-" SHOWS AN EXAMPLE OF THE RESULTING -7'9/):1+ '&[ SPACING!$ >HILE MERIDIANS OF LONGITUDE APPEAR AS EQUALLY SPACED VERTICAL LINES" PARALLELS OF LATITUDE ARE HORIZONTAL LINES DRAWN FARTHER APART AS THE LATITUDE INCREASES$ @ WOULD BE INFINITE AT ,&[ LATITUDE$

7ERCATOR CHARTS HAVE THE DISADVANTAGE THAT GEOMETRIC DISTORTIONS INCREASE AS THE DISTANCE FROM THE EQUATOR INCREASES$ =HE 7ERCATOR PROJECTION IS THEREFORE NOT SUITABLE FOR POLAR REGIONS$ / CIRCLE OF EQUAL ALTITUDE" FOR EXAMPLE" WOULD APPEAR AS A DISTORTED ELLIPSE AT HIGHER $ /REAS NEAR THE POLES" E$ G$" 3REENLAND" APPEAR MUCH GREATER ON A 7ERCATOR MAP THAN ON A GLOBE$

4T IS OFTEN SAID THAT A 7ERCATOR CHART IS OBTAINED BY PROJECTING EACH POINT OF THE SURFACE OF A GLOBE FROM THE CENTER OF THE GLOBE TO THE INNER SURFACE OF A HOLLOW CYLINDER TANGENT TO THE GLOBE AT THE EQUATOR$ =HIS IS ONLY A ROUGH APPROXIMATION$ /S A RESULT OF SUCH A PURELY GEOMETRICAL! PROJECTION" @ WOULD BE PROPORTIONAL TO TAN 6AT" AND CONFORMALITY WOULD NOT BE ACHIEVED$

%1499/3- &.++98

4F WE MAGNIFY A SMALL PART OF A 7ERCATOR CHART" E$ G$" AN AREA OF )&' LATITUDE BY *&' LONGITUDE" WE WILL NOTICE THAT THE SPACING BETWEEN THE PARALLELS OF LATITUDE NOW SEEMS TO BE ALMOST CONSTANT$ /N APPROXIMATED 7ERCATOR GRID OF SUCH A SMALL AREA CAN BE CONSTRUCTED BY DRAWING EQUALLY SPACED HORIZONTAL LINES" REPRESENTING THE PARALLELS OF LATITUDE" AND EQUALLY SPACED VERTICAL LINES" REPRESENTING THE MERIDIANS$

=HE SPACING OF THE PARALLELS OF LATITUDE" Y" DEFINES THE SCALE OF OUR CHART" E$ G$" +MM%NM$ =HE SPACING OF THE MERIDIANS" X" IS A FUNCTION OF THE MEAN LATITUDE" 6AT 7- Lat ! Lat $ x = $ ycos Lat Lat = min max M M 2

/ SHEET OF OTHERWISE BLANK PAPER WITH SUCH A SIMPLIFIED 7ERCATOR GRID IS CALLED A 82'11 '7+' 51499/3- 8.++9 ANDISA VERY USEFUL TOOL FOR PLOTTING LINES OF POSITION$

')#( 4F A CALCULATOR OR TRIGONOMETRIC TABLE IS NOT AVAILABLE" THE MERIDIAN LINES CAN BE CONSTRUCTED WITH THE GRAPHIC METHOD SHOWN IN %'& !#-# -

>E TAKE A SHEET OF BLANK PAPER AND DRAW THE REQUIRED NUMBER OF EQUALLY SPACED HORIZONTAL LINES PARALLELS OF LATITUDE!$ / SPACING OF ) # '& MM PER NAUTICAL MILE IS RECOMMENDED FOR MOST APPLICATIONS$

>E DRAW AN AUXILIARY LINE INTERSECTING THE PARALLELS OF LATITUDE AT AN ANGLE NUMERICALLY EQUAL TO THE MEAN LATITUDE$ =HEN WE MARK THE MAP SCALE DEFINED BY THE SPACING OF THE PARALLELS! PERIODICALLY ON THIS LINE" AND DRAW THE MERIDIAN LINES THROUGH THE POINTS THUS LOCATED$ 1OMPASSES CAN BE USED TO TRANSFER THE MAP SCALE FROM THE CHOSEN MERIDIAN TO THE AUXILIARY LINE$

#34243/) ".'798

2OR GREAT CIRCLE NAVIGATION" THE -34243/) 5740+)9/43 OFFERS THE ADVANTAGE THAT '3< GREAT CIRCLE APPEARS AS A STRAIGHT LINE$ ;HUMB LINES" HOWEVER" ARE CURVED$ / GNOMONIC CHART IS OBTAINED BY PROJECTING EACH POINT ON THE EARTH'S SURFACE FROM THE EARTH'S CENTER TO A PLANE TANGENT TO THE SURFACE$

=HERE ARE THREE TYPES OF GNOMONIC PROJECTION-

4F THE PLANE OF PROJECTION IS TANGENT TO THE EARTH AT ONE OF THE POLES 541'7 -34243/) ).'79 !" THE MERIDIANS APPEAR AS STRAIGHT LINES RADIATING FROM THE POLE$ =HE PARALLELS OF LATITUDE APPEAR AS CONCENTRIC CIRCLES$ =HE SPACING OF THE LATTER INCREASES RAPIDLY AS THE POLAR DISTANCE INCREASES$

4F THE POINT OF TANGENCY IS ON THE EQUATOR +6:'947/'1 -34243/) ).'79 !" THE MERIDIANS APPEAR AS STRAIGHT LINES PARALLEL TO EACH OTHER$ =HEIR SPACING INCREASES RAPIDLY AS THEIR DISTANCE FROM THE POINT OF TANGENCY INCREASES$ =HE EQUATOR APPEARS AS A STRAIGHT LINE PERPENDICULAR TO THE MERIDIANS$ /LL OTHER PARALLELS OF LATITUDE SMALL CIRCLES! ARE LINES CURVED TOWARD THE RESPECTIVE POLE$ =HEIR CURVATURE INCREASES WITH INCREASING LATITUDE$

4N ALL OTHER CASES 4(1/6:+ -34243/) ).'79 !" THE MERIDIANS APPEAR AS STRAIGHT LINES CONVERGING AT THE +1+;'9+* 541+ $

=HE EQUATOR APPEARS AS A STRAIGHT LINE PERPENDICULAR TO THE CENTRAL MERIDIAN THE MERIDIAN GOING THROUGH THE POINT OF TANGENCY!$ :ARALLELS OF LATITUDE ARE LINES CURVED TOWARD THE POLES$

')#) %'& !#-$ SHOWS AN EXAMPLE OF AN OBLIQUE GNOMONIC CHART$

$&% !"-#

/ GNOMONIC CHART IS A USEFUL GRAPHIC TOOL FOR LONG#DISTANCE VOYAGE PLANNING$ =HE INTENDED GREAT CIRCLE TRACK IS PLOTTED AS A STRAIGHT LINE FROM / TO 0$ 9BSTACLES" IF EXISTING" BECOME VISIBLE AT ONCE$ =HE COORDINATES OF THE CHOSEN WAYPOINTS PREFERABLY THOSE LYING ON MERIDIAN LINES! ARE THEN READ FROM THE GRATICULE AND TRANSFERRED TO A 7ERCATOR CHART" WHERE THE WAYPOINTS ARE CONNECTED BY RHUMB LINE TRACKS$

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