§  73.1720   Daytime.

   Operation is permitted during the hours between average monthly local
   sunrise and average monthly local sunset.

   (a) The controlling times for each month of the year are stated in the
   station's instrument of authorization. Uniform sunrise and sunset times
   are specified for all of the days of each month, based upon the actual
   times of sunrise and sunset for the fifteenth day of the month adjusted
   to the nearest quarter hour. Sunrise and sunset times are derived by
   using the standardized procedure and the tables in the 1946 American
   Nautical Almanac issued by the United States Naval Observatory.

   (b) [Reserved]

   [ 43 FR 45849 , Oct. 4, 1978]