The Ephemeris for 1848 and 1849 gives apparent places after the form of the 

 London, Paris, and Berhn Ephemerides. 



The Gaussian constants for the mean Ephemeris are derived from the node, 

 inchnation, and periheHon point, as follows : 



CONSTANTS FOR THE POSITION OF THE ORBIT, REFERRED TO THE MEAN EGIUINOX OF 



JANUARY 1, 1847. 



23° 39' 33". 32 = u = the mean obliquity of the Ecliptic, Jan. 1, 1847. 



tan ■*■ := --, for the mean place of the node. 



cosgj 



s =■*• — « 



sin I 

 sinip 



a cos A = — sin S2 cos i 



a sin A = + cos Q, 



b cos B = 4" * cos S 



i sin B = -|- sin Q, cos a 



c cos C = 4" * sii^ S 



c sin C = -}- sin Q sin a 



A' = A + (rt — g2) — 0.17 X •'o = 137 12 52.04 

 B' = B + (rt — S^) — 0.17 X "0 = 47 46 27.35 

 C' = C + (rt— S2) — 0.17 X «'o = 43 53 37.36 



log a = 9.9998769 



log b = 9.9662261 



log c = 9.5800982 



The constant part of aberration = — 0.17 X "-o = — 3 .67, is adapted to an 

 assumed value 21 .62 of the daily increase of the true anomaly. The variable 

 part never amounts to 0".2. It has, however, been computed from the formula. 



(/ A,, = y X [— 0.17 X rf^o — (A X « — 0.17) ^] 

 , ^ , <^ Ao 



<^ Do = y' X 



7 



Where A ^ Neptune's geocentric distance. 



= Struve's constant of aberration time. 



d V J 

 8- 17'. 78 



24" 0" 0' 

 * =7.76052 



