144 



Parallax of 6 1 1 Cygni, deduced from 



Table XVIII. — Parallax Equations. 

 Position-Angle. Star 13. 



Plate. 



1 

 2 



3 



4 

 5 

 6 



7 



10 

 11 

 12 

 13 



15 

 16 



17 

 18 



19 

 20 



Reduced Angle. 

 34l°25 / 9" 



2430 



25 10 



2540 

 25 o 



24 55 



25 6 



25 14 

 25 13 



24 59 



25 4 



1. 00a; 

 1. 00 

 1. 00 



1. 00 

 1. 00 

 1. 00 

 1. 00 



1. 00 

 1. 00 

 1. 00 

 1. 00 



23 54 1. 00 



24 13 1. 00 

 24 19 1. 00 

 24 47 1. 00 

 2352 1. 00 

 23 59 1. 00 



341 24 46.0= Adopted 



—1. 14?/ 



— 1.13 



— I..-I3 



—0.08 

 -0.04 

 — 0.04 

 — 0.04 



+0.89 

 +0.90 

 -f-0.90 

 +0.90 



4-1.42 

 +I-45 

 4-1-45 

 +I-45 

 -fi-45 

 + I-45 

 Mean. 



—73 



n 4-23. 



—73 



—16. 



—73 



+24. 



—72 



+54- 



—66 



4-I4- 



—66 



+ 9- 



-65 



+20. 



—74 



4-28. 



—74 



+27. 



—74 



+'I3- 



—74 



4-i8. 



+74 



—52. 



4-69 



—33- 



4-69 



—27. 



4-69 



4- 1. 



+69 



—54- 



+69 



—47- 





Residuals 





in arc 



of 





great circle. 







4-o". 1 1 







— 



.41 







+ 



.12 







+ 



•46 







— 



.04 







— 



.11 







+ 



•05 







4- 



.04 







+ 



.02 







— 



.16 







— 



.IO 







— 



.20 







4- 



•03 







4- 



.11 







+ 



.48 







— 



.26 







— 



.16 



Normal Equations. 

 +17. 00a/ 4" 8.663/' — 365.00IT 4- 2.00 = 



4-19.62 4- 601.51 — 270.02 = 



4-85293.00 — 30221.00=0 



Solution. 



. = -\- o // .44oi zfco^.0643 



[yv\ 



= 4672. 

 a =2754". 25 

 Factor = .01336 



y' = — 4 -9631 ±4 -59i 

 a/ = -{-ii .8592 ±4 .582 



In Angle. Arc of great circle. 

 Probable error of one equation = zhi2".32 = ±o".i646 



