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词汇 nautical twilight
释义

Definition of nautical twilight in English:

nautical twilight

noun

  • The two periods of the day immediately before sunrise and after sunset when the sun is less than 12 degrees below the true horizon.

Origin

1930s; earliest use found in Nautical Almanac 1937.

Definition of nautical twilight in US English:

nautical twilight

noun

  • The two periods of the day immediately before sunrise and after sunset when the sun is less than 12 degrees below the true horizon.

Origin

1930s; earliest use found in Nautical Almanac 1937.
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