T 11 I! () It I'. I T OF U U A N U S. 



111 tin- equations of condition ten years has boon adopted for the unit of time, 

 in order to make the general value of tin- coefficients as nearly eciual as possible, 

 ami tin- time lias been counted from tin- epoch 1*30.0, in order to have the posi- 

 tive and negathe values of t in the equations more nearly halanced. To distin- 



guish these values of be and < v they are marked with an accent. This unit of 



> 

 time gives o.s;il I for the value of ' in arc, whence 



oil 



-. t '^. - 0.891. 



dri < I 



The equations of condition are now formed by putting in the preceding equa- 

 tions for heliocentric longitude and radius vector 



6, 



>L 

 For the coefficients - have been taken one-hundredth the perturbations of 



(it' 



longitude j)roduced by Neptune, as given in the heliocentric ephemeris at the end 

 of Chapter V. The corrected mass of Neptune will then be 



1 (H 



17000*- 100 



Finally, I remark that all the preceding comparisons are made with the helio- 

 centric ephemeris as printed, without the correction indicated in the column 

 ail joining it, but in the following equations this correction is for the first time 



introduced. 



