52 LECTURES ON THE LUNAR THEORY. 



Substitute in the equation for a 21 , 



- 2n'+p? - 

 -8 





n + 2 (w - n') ( -j>) = + 



* 



- - - 



71* ~ it ~t~ 79 



The various terms give 



2(n-ri)(n-p)a, 



2 a 



a., 

 3 



-8- - ,- -(n-n f )(n-p)(l 



n 2n + p 



-4(n-n')(n-p)(l+b.)b._ 



Sw 14 (!+&) 



6- 



(n-2n'+pY 



n 



-01545,45 

 -03784,83 



-'07264,10 



-'04415,05 



'05144,47 



'01969,25 



'04608,58 



05373,43 



-85321,6 



-1-15842,8 



_ 



30521,2 



a sl = -17605,6. 



The equation for 6 21 is 



n n 



n n 



[LECT. 



