NOTE. Civil twilight ends in the evening when the center of the sun's disk is 6 degrees below the horizon and begins in the morning when the center of the sun's disk is 6 degrees below the horizon.
Daytime flight only (civil twilight is used to define day/night)
No flight above 10,000 feet MSL ...
NIGHT
the time between the end of evening civil twilight and the beginning of morning civil twilight, as published in the American Air Almanac, converted to...
NIL
Nothing, no information ...
 See also: Flight, ICAO, Airport, Navigation, Pilot
  
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