In Starlan d With a Three = In ch Tel es cope A Conveniently Arranged Guide fo r t he U s e o f the Amateur Astronomer - W ith Forty Diagrams o f t he C onstellations and Eight o f the M oon By William Ty ler Qlcott “ Author of A Field Book of the Stars O P YRI GH T 1 0 C , 9 9 B Y WI LL I A M T YLER OLCOT T t he k nick et bock er pres s , n ew mot h I NTRODUCTION HE s ole purpos e of this book is t o afford a c onvenient guide for th e amat eur ast ronomer when engaged in 0 i s o t el es c p c Ob ervati n . ’ s o st of t h e oo s s t h e s A ide fr m a udy m n urface , Ob erva tion of double st ars is s ure t o prove th e mos t att ractive for h e os s s o of o t work t p e s r a s mall t ele s c pe . The brigh er o s th e o no f t i d uble n vice will have di ficul y n finding , bu t t hos e below t he t hird magnitude are O ften difficult t o locate wit hout reference t o a diagram of th e con st ella tion of which it is a part - hence t h e aut hor h a s s een fit o s it s o s t t place uch a diagram where can be ea ily c n ul ed . It is pre supp os ed t hat th e owner of t h e t ele s cope is h o o s I t s o familiar wit h t e c nstellat i n . t hen h uld be an s tt t th e s s st o f t h e o ea y ma er , wi h a i ance acc mpanying o find he o s s t o t h e s t t t t t . diagram , d uble ar men i ned in ex The con stellation s are grouped under t h e s ea s on s for th s of o e ake c nvenience . of t h e st s t o o s of th e t Many ar have fain c mpani n nin h , t t or t t s . s o s t en h , fain er magni ude The e d uble are in er st s o t o t os w h o s t o t st t s t e ing lely h e de ire e heir eye igh , or t h e o s of t s s s o t a s p wer heir gla . They are di app in ing c ompared wit h t h e beautiful double s t h e magnit ude O f os o t s o on s a s wh e c mponen are m re nearly a par , uch iii 2 117 7 4 Intro du ctio n s o o s h as C t s . t o t a r , (y) Le ni ,(y) Virgini The au h r here o t h e o s t o ot s o t t t os os f re arranged d uble be n ed , ha h e m t wo rt hy of Ob s erv ation c om e first in the column as s igned t o t hem . The chapter on the moon is arranged according t o th e s a s th e tt on th e o s t s co s s s ame idea ma er d uble ar , nci ene t s at s s and brevi y being e pecially aimed . The plea ure of s o s o s t t t th e t o s elen graphy are fa cina ing , ha au h r feel a s s ured t hat th e student will add t o t h e brief outline o t th e r here given by c lla eral reading . Only p incipal object s of int ere st are mentioned in t h e t ext accompany in s s s of th e oo O s g each ucce iv e View m n . The b erver will n ot e a wealt h of det ail in every peep he t ake s at the m oon t hat will add greatly t o his plea s ure ’ o t th e m is on d étre of th e oo is con In a w rd , hen , b k v enience of t o h a s o arrangement . The au h r f und by ex perience t hat what t h e st udent m ost needs when he is s t th e t s o is t o at t t Ob erving wi h ele c pe , a page glance ha s a s t o t h e o t h e s s t o will erve a guide bjec de ire view , and f o s o s t which a f rd c nci e dat a rela ive t o that object . The ’ s t o t th e st t s s o th e s u b diagram heref re direc uden vi i n , and ect tt afford s the c s s o t o in s j ma er ne e ary inf rma i n each ca e . t t t t s o t s o s u s e com The fac ha here are few ele c pe in , arat iv el s n t s o t s for the p y peaki g , in a grea mea ure acc un tt nt s t s t o o t th e li le i ere in a r n my aken by public . I f t he s e page s s erve t o awaken t he s light es t int ere st in th e s t st of th e s th e t o fa cina ing udy heaven , au h r will feel amply repaid . THE DI AGRAMS OF THE CONSTE LL ATIONS HE diagrams repre s ent th e appearance of th e con s t ell ations t h e s s o t in ea n in which hey are placed , and favorable location for ob s ervat ion w a s chiefly con s s id ered in t hu s grouping t hem . The tudent can vary o his o th e arrangement t s uit c nvenience . As th e t is th e s t s t for s t - win er lea de irable ime ar gazing , th e great er number of con st ellation s h ave been purp os ely o h e o s o gr uped in t t her s ea n s . The s o-called circump olar const ellation s are of o s for o s t o a t t of t h e c ur e available b erva i n any ime year , and the s tudent can ch oos e his ow n t ime for s t udying t hem . At the oot of of o st t o for f each diagram a c n ella i n , s t h e o f ready reference , appear name and page number o o s o i the c nst ellati n b unding t . Only th e const ellat ion s vis ible in th e latit ude of th e New E ngland and Middle St at e s have been included in t oo his b k . The aut hor pre supp os e s that the t ele s cope t o be u s ed in o t o t t s - oo is n ot t s c nnec i n wi h hi b k equipped wi h circle , otherwis e rec ours e s h ould be had t o s ome s uch b ook a s ’ s Celes ti a l Ob ects or Common Teles co es for o Webb j f p , a m re V vi The Diagrams O f the Co ns tell ation s t o t o of th e o t s of t st t s of exac l ca i n bjec in ere , in erm s o Right A s cen i n and Declination . F or t h e m ost part only d ouble s t ars wit h a primary of t h e s t t or t a s it is ix h magni ude brigh er are given , difficult t o direct t h e t ele s c ope at a star of le s s er magni s s i s o o i o t ude unle t p s it i n s accurat ely kn wn . In s earching for double st ars many faint y et beaut iful s t s o s s o t t it is t o pair and riple are b erved , ha well have ’ s oo a s s o t t t s o t s uch a b k Webb , in rder ha he e bjec can be identified .