Everything about Dusk totally explained
Dusk refers to the
twilight after
sunset.
Civil dusk is the time at which the
sun is 6
degrees below the
horizon in the evening. At this time objects are distinguishable and some stars and planets are visible to the naked eye.
Nautical dusk is when the sun is 12 degrees below the horizon in the evening. At this time, objects are no longer distinguishable, and the horizon is no longer visible to the naked eye.
is the time at which the sun is 18 degrees below the horizon in the evening.
At this time the sun no longer illuminates the sky, and thus no longer interferes with astronomical observations.
Dusk shouldn't be confused with
sunset, which is the moment when the trailing edge of the Sun itself sinks below the horizon.
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