140 



Parallax of 61 l Gygni, deduced from 



Table XVIII. — Parallax Equations. 

 Position-Angle. Star 48. 

















Residuals 

















in arc of 



Plate. 



Reduced Angle. 











1 



jreat circle. 



I 



io5° 5 2'58" 



I.OOx' 



—1. uy' 



+ 68. n 



-3 /; 



= .0 



+".03 



2 



52 



1. 00 



— 1.13 



+ 74- 



—61 



= .0 



— -35 



3 



53 23 



1. 00 



— I-I3 



+ 74- 



4-22 



= .0 



4- .22 



4 



5i 32 



1. 00 



—0.08 



+ 102. 



-89 



= .0 



- .48 



5 



53 43 



1. 00 



—0.04 



+119. 



+42 



= .0 



+ .46 



6 



53 9 



1. 00 



—0.04 



+119. 



+ 8 



= .0 



4- .22 



7 



5248 



1. 00 



—0.04 



+121. 



—13 



= .0 



4- .08 



8 



52 55 



1. 00 



+0.88 



+ 80. 



— 6 



= .0 



4- .06 



9 



53 3 



1. 00 



+0.88 



+ 80. 



+ 2 



= .0 



4- .12 



10 



52 19 



1. 00 



+0.89 



+ 89. 



—42 



= .0 



— .16 



ir 



5242 



1. 00 



+0.90 



+ 9 2 - 



—19 



= .0 



— .00 



12 



52 36 



1. 00 



+0.90 



4- 9 2 - 



—25 



= .0 



— .04 



13 



52 8 



1. 00 



+0.90 



4- 92. 



—53 



= .0 



— -24 



15 



53 38 



1. 00 



+1.42 



— no. 



4-37 



= .0 



4- .00 



16 



54 4 



1. 00 



+I-45 



121. 



4-63 



= .0 



4- .16 



17 



54 12 



1. 00 



+I-45 



121. 



4-71 



= .0 



4- .22 



18 



5232 



1. 00 



+1-45 



122. 



—29 



= .0 



— -47 



19 



53 55 



1. 00 



+I-45 



122. 



+54 



= .0 



4- .10 



20 



53 5i 



1. 00 



+I-45 



—122. 



4-50 



= .0 



4- .07 



105 53 1.0 = Adopted Mean. 



Normal Equations. 

 4- i9.oox / -f-io.42y / 4- 484.00II 4- 



+21.16 — 836.67 

 4-201090.00 



Solution. 



II — -fo^.2794 ±o // . 0766 [yv~\ -- 



y' = -\-2 .0965 ±8 .487 ff 



a/ = — 8 .7418 ±8 ■ .453 Factor = 



9.00 = 

 + 280.52 = 

 — 50207.00 = 



In Angle. 

 Probable error of one equation = ±25 // .49 



22847. 

 - 1422 // .69 

 .00690 



Arc of great circle. 

 ±0^.1758 



