| 单词 | astronomical twilight |
| 释义 | astronomical twilightnouneither of two periods of partial darkness, after sunset or before sunrise, when the center of the sun is more than 6° but less than 18° below the horizon. Words nearby astronomical twilightastronomical clock, astronomical distance, astronomical frame of reference, astronomical telescope, astronomical triangle, astronomical twilight, astronomical unit, astronomical year, astronomy, astrophotography, astrophotometry Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 |
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