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For example, very old people may be said to be "in the twilight of their lives".
There are three established and widely accepted subcategories of twilight: civil twilight (nearest the horizon), nautical twilight, and astronomical twilight (farthest from the horizon).
In the United States' military, the initialisms BMCT (begin morning civil twilight, i.e.
The period may affect when pilots require a night rating to fly aircraft.
In the US, civil twilight for aviation is defined in Part 1.1 of the Federal Aviation Regulations (FARs) Morning nautical twilight begins (nautical dawn) when the geometric center of the sun is 12° below the horizon in the morning and ends when the geometric center of the sun is 6° below the horizon in the morning.