of Bessel's Astronomical Observations. 



therefore 6 —J— /3 = 



437 



cos? m ,, - _< — t COS? 



cos (f-lj ' P 2 • cos ^— jj> 



b and b' being known by the level, /3 may be found, and the 

 agreement of the determinations obtained hi both positions 

 will prove, that a great circle accords with the four observed 

 points of the curve, described on the celestial sphere by the 

 line of collimation. 



The observations of the pole star made with this view are 

 the following: 



The Circle turned to the East. 



Mean 



-f 0-274 y=l4-ia 



Mean +0013 -/-2312 



The 



