From the above 35 observations 

 the mean zenith distance = 33" 12' 53" ,80+,59p — ,35e. 



Hence 55", ll—,54p—,45e = 53,80 rf-,59p— ,35e 



p= 1",1— ,09e. 

 e cannot be so great as half a second, and therefore ,09e is too 

 small to be noticed. Therefore from these results the parallax of 

 Arcturus = 2",2; 



And by 77 observations, the mean zenith distance = 

 33''.12' 54",45+,05j) — ,4e. By 15 observations in July and August, 

 mean zen. dist. = 33° 12' 54", 50 + ,2p + ,68e. 



