184 



THP] ORBIT OF URANUS. 



on page 182; column (2) those just given depending on the product of the masses 

 of Jupiter and Saturn. 



Mean Elements of Uranus. 

 If, instead of the elements of Uranus affected by the great inequality, we wish 

 the absolute mean elements, these are to be obtained by adding to the elements 

 already given the constants applied to the perturbations hi, M, hk, and 5x» to make 

 the perturbations vanish at the epoch 1850.0, and also the corrections (p. 113) 

 which we have subtracted from the elements and added to the perturbations to 

 reduce the latter to a small quantity during the period for wliich tlie tables are 

 likely to be used. We thus find the following mean elements : 



Elements V of Uranus. Epoch, 1850, Jan. 0, Greenwich mean noon. 



Longitude of the perihelion 



Mean longitude at epoch, 



Eongitude of the node. 



Inclination of the orbit, 



Eccentricity, 



Eccentricity in seconds, 



^lean motion, 



IjOg mean distance (uncorrected). 



The same corrected. 



True mass of Neptune, 



19700 



