MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 77 



By the aid of the preceding table, and using 71, cp, i, aud 6, as given on page 59, an ephemeris 

 was computed for each opposition at which observations were made from 1807 to 1884 and 

 compared with these observations. With the residuals thus obtained equations of condition were 

 formed, aud from their solution the following correction to the elements obtained: 



O / /■ 



g = 108 28 35.7 



n = 274 49 19.2 1 



6 = 5 5 17.5 1 1872.0 



i = 8 36 23.0 J 



tp = S 4 52.4 



/' 

 n = 775.920408 



Epoch: November 2.0, 1872, Greenwich mean time. 

 U. 8. Naval Observatory. , 



