5$ 



are necessarily more uncertain than the elements from which the 

 angular distances of the stars Rigel, a Orionis, and a Cygni have 

 been determined in 1755, 1800 and 1821. 



From the above determination, supposing the Pole Star without 

 proper motion. 



The annual luni-solar precession in longitude for 1788 = 50",38 

 And the annual general precession . . . = 50, 21 . 



