100 OUT1NES OP NATURAL PHILOSOPHY. 



them by 57.29578, &c. the number of degrees in 

 an arch equal to the radius, 



b. Because, in the case of the sun, c is small, (viz, 

 = .0168 14), its powers above the third may be re- 

 jected ; and so the equation reduced is, 



y = (1 55' 26".35) sin x + (!' 12".68) sin 2 x. 



+ (I".05)sin3,r. 



101. The Radius Fee tor r, or the line drawn 

 from the sun to the earth, may also be express- 

 ed in terms of the mean anomaly, supposing the 

 mean distance = 1. 



2" 1 3' 16 



3 45 



3 5 



lj ) cos 5 <r 



The 



