Definition of the term 'begin morning civil twilight ' per official documentation of the United States Department of Defense.
begin morning civil twilight
The period of time at which the sun is halfway between beginning morning and nautical twilight and sunrise, when there is enough light to see objects clearly with the unaided eye. At this time, light intensification devices are no longer effective, and the sun is six degrees below the eastern horizon. Also called BMCT. (US DoD)
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