Beginning of Morning Nautical Twilight

См. также в других словарях:

• 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… …   Military dictionary

• Twilight — For other uses, see Twilight (disambiguation). Twilight at Riga Bridge …   Wikipedia

• twilight — The period of incomplete darkness following sunset and preceding sunrise. Twilight is designated as civil, nautical, or astronomical, as the darker limit occurs when the center of the sun is 6°, 12°, and 18°, respectively, below the celestial… …   Aviation dictionary

• first light — The beginning of morning nautical twilight; i.e., when the center of the morning sun is 12 degrees below the horizon …   Military dictionary

• Dawn — is the beginning of morning twilight Dawn sky …   Wikipedia

• BMCT — Begin Morning Civil Twilight ( BMCT ) is a military term defined by the Department of Defense (DoD) of USA. It is defined as the period of time at which the sun is halfway between beginning morning and nautical twilight and sunrise, when there is …   Wikipedia

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