begin morning nautical twilight (US DoD Definition)
Definition of the term 'begin morning nautical twilight ' per official documentation of the United States Department of Defense.
begin morning nautical twilight
The start of that period where, in good conditions and in the absence of other illumination, enough light is available to identify the general outlines of ground objects and conduct limited military operations. Light intensification devices are still effective and may have enhanced capabilities. At this time, the sun is 12 degrees below the eastern horizon. Also called BMNT. (US DoD)
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