142 



Parallax of 6 1 1 Cygni, deduced from 



Table XVIII. — Parallax Equations. 

 Position-Angle. Star 32. 

















Residuals 

















in arc 



of 



Plate. 



Reduced ADgle. 











great circle. 



I 



i72°39 / 4 9 // 



i.ooc' 



—I.i4y' 



+93 



.n -30. 



"=o 



+o".o8 



2 



39 51 



1. 00 



— 1-13 



+93 



—28. 



= 



+ 



.10 



3 



39 55 



1. 00 



— I-I3 



+93 



—24. 



= 



+ 



.14 



4 



39 I2 



1. 00 



—0.08 



+37 



-67. 



= 



— 



•43 



5 



39 41 



1. 00 



— 0.04 



+75 



-33. 



= 



— 



.18 



6 



39 5i 



1. 00 



—0.04 



+75 



—28. 



= 



— 



.07 



7 



40 2 



1. 00 



—0.04 



+73 



—17- 



= 



+ 



•03 



8 



40 11 



1. 00 



+0.88 



+92 



— 8. 



= 



+ 



.10 



9 



40 1 



1. 00 



+0.88 



+92 



—18. 



= 



— 



.00 



10 



39 59 



1. 00 



+0.89 



+9i 



— 20. 



= 



— 



■03 



11 



40 5 



1. 00 



+0.90 



+90 



—14. 



= 



+ 



•03 



12 



40 18 



1. 00 



4-0.90 



+90 



I. 



= 



+ 



• 17 



13 



40 4 



1. 00 



+0.90 



+90 



— IS- 



= 



+ 



.02 



15 



41 6 



1. 00 



+1.42 



—88 



+47- 



= 



— 



.02 



16 



4047 



1. 00 



+1-45 



—80 



+28. 



= 



— 



•19 



17 



41 17 



1. 00 



+I-45 



—80 



+53. 



= 



+ 



.12 



18 



4i 36 



1. 00 



+1-45 



—79 



+77- 



= 



+ 



•32 



19 



41 19 



1. 00 



+I-45 



—79- 



+60. 



= 



+ 



.14 



20 



40 34 



1. 00 



+I-45 



—79- 



+I5- 



= 



— 



•33 



i 



72°4o 19.0 = A 



dopted 



Mean. 













Normal Equations. 



+i9.ooa; / +10.423/ + 649.00II — 23.00 = 



4-21. 16 — 546.78 4- 445.80 = 



+138871.00 — 49582.00 = 



Solution. 

 II =-fo // .3442 ± o // .o489 

 y f =— 9 .5621 ±4 -251 

 a/ 5 .3013 ±4 .638 



[«»] =5382. 



a =2155.^55 

 Factor = .01045 



In Ang'e. Arc of great circle. 

 Probable error of one equation = ±12. ^37 — = bo/ / i293 



