NEPTUNE DLSCOYEKED. 



cated by the small circle at L, that assigned by Mr. Adams by the 



small circle at A, and the place at which it was 



actually found by the dot at N. The distances 



of L and A from N may be appreciated by the 



circle which is 'described around the dot N, 



and which represents the apparent disk of the 



moon. 



; The distance of the observed place of the planet 



from the place predicted by M. Le Yerrier was 



less than two diameters, and from that predicted 



by Mr. Adams less than five diameters of the 



lunar disc. 



12. In obtaining the elements given above, Mr. 

 Adams based his calculations on the observations 

 of Uranus made up to 1840, while the calcula- 

 tions of M. Le Yerrier were founded on observa- 

 tions continued to 1845. On subsequently taking 

 into computation the five years ending 1845, Mr. 

 Adams concluded that the mean distance of the 

 sought planet would be more exactly taken at 

 33-33. 



After the planet had been actually discovered, 

 and observations of sufficient continuance were 

 made upon it, the following proved to be its more 

 exact elements : 



Epoch of the elements 

 Mean longitude at the epoch 

 Mean distance from sun 

 Eccentricity of orbit 

 Longitude of perihelion 

 Longitude of ascending node 

 Inclination of orbit . 

 Periodic time 

 Mean annual motion . 



Greenwich. 



Uan.l847,M. Noon. 

 328 32' 44" -2. 



30-0367. 



0-00871946. 



47 12' 6" -50. 



130 4' 20" -81. 



1 46' 58" -97. 



164-6181 years. 



2-18688. 



13. Now it will not fail to strike every one who devotes the 

 least attention to this interesting question, that considerable 

 discrepancies exist, not only between the elements presented in 

 the two proposed solutions of this problem, but between the actual 

 elements of the discovered planet and both of these solutions. 



181 



