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Nautical twilight

For technical definition, please follow this link to the U.S. Naval Observatory Astronomical Applications website.

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nautical twilight
Weather; Meteorology

The twilight stage during which the sun's unrefracted center is at elevation angles −6° > ''h'' 0 > −12°. During a clear evening's nautical twilight, horizontal illuminance ...

nautical twilight
Astronomy; Planetary science

The time when the Sun is 6-12 degrees below the horizon. Sky begins to get noticeably bright.

nautical twilight
Aerospace; Space flight

For technical definition, please follow this link to the U.S. Naval Observatory Astronomical Applications website.

nautical twilight
Weather; General weather

The time after civil twilight, when the brighter stars used for celestial navigation have appeared and the horizon may still be seen. It ends when the center of the sun is 12 ...

end of evening nautical twilight
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Occurs when the sun has dropped 12 degrees below the western horizon, and is the instant of last available daylight for the visual control of limited ground operations. At end of ...

begin morning nautical twilight (BMNT)
Military; General military

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 ...

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