(astronomy) The interval of incomplete darkness between sunrise or sunset and the time at which the center of the sun's disk is 12° below the celestial horizon.
Nautical twilight
| Sci-Tech Dictionary: nautical twilight |
| Cosmic Lexicon: Nautical twilight |
The time when the Sun is 6-12 degrees below the horizon. Sky begins to get noticeably bright.
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 | first light |
| twilight |
| BMCT |
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 | Sci-Tech Dictionary. McGraw-Hill Dictionary of Scientific and Technical Terms. Copyright © 2003, 1994, 1989, 1984, 1978, 1976, 1974 by McGraw-Hill Companies, Inc. All rights reserved. Read more |
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| Cosmic Lexicon. Copyright 1996 Planetary Science Research Discoveries. Read more |
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