IN PHYSICAL ASTRONOMY, 
27 
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d Jida 
dad aF(n t)’ 
-b 1 
*aFnt = Fnt , rdR 
da 
d r 
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._ - . (a .. - . a ' cos . a l_ = I + jjMc 0 s9 + ^ - ^ 2 cos2 8 + &c.j 
{a s -2aa ( cos 8 + a, 2 }^ a, l da da da I 
— {a 
a a s ‘ CQS ^ { ^ 3,0 + h i cos 8 + 6 3>2 cos 2 9 + &c.} — 
+ ILAli cos 8 + AiAl 2 cos 2 8 + &c. 1 
da da J 
whence 
o d • 6, 0 
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cz d • ^ 3 , l 
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similarly 
