ANSWERS: 4
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Civil is based on an official timetable. Nautical is when the sun has dropped below (as I recall) 5 degrees below the horizon. Astronomical I'm not familiar with.
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Astronomical twilight - Sun is 12-18 degrees below horizon Nautical twilight - Sun is 6-12 degrees below horizon Civil twilight - Sun is 0-6 degrees below horizon Civil twilight is what people think of as twilight.
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The United States Naval Observatory explains what each of these terms means:
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The United States Naval Observatory explains what each of these terms means:
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