392 



H. MOHN. METEOROLOGY. 



[NORW. POL. EXP. 



The formula is, t reckoned from Midnight: 



c = a l . sin (A t + t) -f- 2 s * n (A 2 + 2 1) + a 3 . sin (A 3 -f 3 1). 

 The constants found are 



Taking the means for the dark season, for the sunny season, for the equi- 

 noctial months, and for the year, we obtain 



