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Unless specified differently by the appropriate authority, 'night' is defined as the period between...

  • A

    the end of evening civil twilight and the start of morning civil twilight the next day.

  • B

    twilight and dawn.

  • C

    sunset and sunrise.

  • D

    the start of evening civil twilight and the end of morning civil twilight the next day.

Refer to figure.
ICAO Annex 1

Night. The hours between the end of evening civil twilight and the beginning of morning civil twilight or such other period between sunset and sunrise, as may be prescribed by the appropriate authority.

Note: Civil twilight ends in the evening when the centre of the sun’s disc is 6 degrees below the horizon and begins in the morning when the centre of the sun’s disc is 6 degrees below the horizon.

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