nautical twilight
More than 250,000 words that aren't in our free dictionary, Expanded definitions, etymologies, and usage notes. Nautical Twilight: the time when the center of the sun is 12 degrees below the horizon, and only general or vague outlines of objects are visible.
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These latitudes include many densely populated regions of the Earth, including the entire United Kingdom and other countries in northern Europe and even parts of central Europe. However, unlike the term twilight, which describes a time span, the terms dawn and dusk refer to exact moments during the transitions between day and night.Nautical dawn is the moment when the geometric center of the Sun is 12 degrees below the horizon in the morning. Civil twilight is the period when enough natural light remains that artificial light is not needed. The duration of twilight depends on the latitude and the time of the year. Under good atmospheric conditions with the absence of other illumination, during nautical twilight, the human eye may distinguish general outlines of ground objects but cannot participate in detailed outdoor operations.
It marks the beginning of evening astronomical twilight and the end of evening civil twilight. Astronomical dusk is the moment when the geometric center of the Sun is 18 degrees below the horizon in the evening.
Nautical twilight definition is - the period before sunrise or after sunset during which the sun is not more than 12 degrees below the horizon. There is no astronomical twilight at the poles near the winter solstice (for about 74 days at the North Pole and about 80 days at the South Pole).
In the northern hemisphere, includes the center of, Astronomical Twilight: between 48°34' and 54°34' North or South (between 50° and 56° North or South in May or November, between 57° and 63° North or South in April or October). [3][4][5] In the United States' military, the initialisms BMCT (begin morning civil twilight, i.e. It was the perfect location for watching the sunrise. This can occur only at locations within 5.5 degrees of latitude of the Pole, and there only on dates close to the winter solstice. For example, the Easter Vigil is held in the hours of darkness between sunset on Holy Saturday and sunrise on Easter Day — most commonly in the evening of Holy Saturday or midnight — and is the first celebration of Easter, days traditionally being considered to begin at sunset.
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