138 



Parallax of Gl x Cygni, deduced from 



Table XVIII. — Parallax Equations. 

 Position-Angle. Star 37. 















Residuals 















in arc of 



Plate. 



Reduced Angle. 









jreat circle. 



2 



i49°35 / 56 // 



loot/ — 1 - 1 sy / 



+146.II 



— 54 A 



' = 



—".II 



3 



3628 



1. 00 — 1. 13 



+146. 



— 22 



= 



4- .10 



4 



35 37 



1. 00 — 0.08 



+152. 



—73 



= 



— -25 



5 



36 10 



1. 00 — 0.04 



+145- 



—40 



= 



— -05 



6 



36 55 



1. 00 —0.04 



+I45- 



4- 5 



= 



+ .24 



7 



3628 



1. 00 — 0.04 



+143- 



— 22 



= 



4- -07 



8 



3653 



1. 00 +0.88 



4-148. 



4- 3 



= 



+ -21 



9 



3628 



1. 00 +0.88 



+148. 



— 22 



= 



4- .05 



10 



3619 



1. 00 4-0.89 



4-I5I. 



—31 



= 



— .00 



11 



36 22 



1. 00 +0.90 



+ 151. 



—28 



= 



4- .02 



12 



36 3 



1. 00 +0.90 



4-I5L 



—47 



= 



— .10 



13 



35 52 



1. 00 +0.90 



+ 151. 



-58 



= 



— .18 



15 



3S 5 



1. 00 + I -4 2 



-156. 



+75 



= 



4- .07 



16 



37 38 



1.00 +1-45 



—152. 



4-48 



= 



— .10 



17 



3818 



1. 00 +I-45 



—152. 



+88 



= 



4- .16 



18 



37 16 



1. 00 +I-45 



—151. 



+26 



= 



— -24 



19 



37 58 



1. 00 +I-45 



—151- 



+68 



= 



4- .03 



20 



38 2 

 149 36 50 = 



1 .00 +1.45 

 Adopted Mean. 



—151- 



4-72 



= 



4- .06 



Normal Equations. 



4-i8.oo.e / 4- II -56j/ / 4" S64.00II — 12.00 = 



+ 19.86 — 876.04 + 474.39 = 



4-402194.00 — 115427.00 = 



Solution, 

 n = 4- o // .3028 ± o // .0355 



y'=— 3 ^^±6 .039 



a/ = — 11 .3531 ±6 .368 



In Angle. Arc of great circle. 

 Probable error of one equation = ± i5 // .7o= ± o^.ioiS 



[to] =8127. 



a = i336".94 

 Factor = .00648 



