Its 



By 24. observations in tfee winter, 

 .;. mean zenith distance, January 1, ;araoiU 



By 21 observations, summer and' 

 autumn, 1814, mean zenith dis- 

 .,, tam:e,> Jan. 1. 1814, .ci,i 45' 0' 5",00+,21;, 



Hence ;^=-^==:3",5 



Combining this result with the result of the 76 observations 

 before given p = 3,"0, or the double parallax = 6", This re- 

 suit exceeds the former by half a second, but, as has been 

 observed, the smallness of the co-efficient of p necessarily 

 precludes great accuracy. 



The above 45 observations (taking the 



mean annual motion in N. P. D. 



= 9", 12) give the mean N. P. D. 



Jan. 1, 1813 = 81° 36' 59",42 



The former determination was gi 3g ^p 8^ 



Of Cygni. 



By 12 observations near conjunc- 

 tion, mean zenith distance, Jan. * 



_ ^' ^^*^' - , 8<'45'59"42-,80p 



By 10 observations near opposi- 

 tion, mean zenith distance, Jan. 

 ■''^^*^' - 8 45 58,47 + ,72;» 





