392 



H. MOHN. METEOROLOGY. 



[NORW. POL. EXP. 



The formula is, t reckoned from Midnight: 



c = ! . sin (A l + f) + a 2 . sin (A 2 -f- 2 1) -f- a 3 . sin (A 3 -(- 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 



