520 



TABLE VIII. 



Calculation for flat clouds : ^ < 1 = 0.25. 

 De Bilt. December + January, ^ = 78° 37'. 



W 



W^ 



40 



45 



50 



55 



60 



65 



70 



75 



80 



825 



85 



875 



0.596 

 0.568 

 0.543 

 0.518 

 0.492 

 0.462 

 0.425 

 0.372 

 0.290 

 0.230 

 0.166 

 0.086 



0.912 

 0.888 

 0.875 

 0.854 

 0.829 

 0.798 

 0.753 

 0.683 

 0.563 

 0.464 

 0.353 

 0.202 



cos ^ 



R — ^^ —m^sin^ F 



W 



cos 



I^=^ln 



+ mbgsin{mx) 



^\—m2x2 + k 

 ^ (1+^) ^1—^2 



+ 1 —^\ — m2.r2 



m2 = ^2 _ 1 X = sin p 



