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.
| 单词 | nautical twilight |
| 释义 | nautical twilightnoun 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 |
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