346 SEE— THE EULER-LAPLACE THEOREM. [April 24, 



Euler develops the following table : 

 If 



t = o, 



t = 2X, 



f = 37r - 

 t = 47i'» 



t = ZTT - 



there will be 

 P = o, 





He remarks that when therefore for perihelion we have 



I i + r 



and for aphelion 



y g 

 y g 



t = o, 



t = IT - 



t = 27r, 

 t = sir - 

 t = 47r, 

 ^ = 5x - 



+ P, 

 + P, 



I i + r 



+ 0, 



- = + --(1 - iD, 



3' g c 



I I + r , 471" 



(i + lr), 



V £ c 



