516 



Table 172 (concluded) 

 DURATION OF CIVIL TWILIGHT 



85' 



80* 



75* 



70* 



65* 



1 16 



MAY 



1 16 



JUNE 



1 16 



JULY 



1 16 1 



AUGUST 



1 16 



SEPTEMBER 



1 16 



OCTOBER 



1 16 1 



DECEMBER 



SMITHSONIAN METEOROLOGICAL TABLES 



