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Geography Categories
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| Definition Of: |
ASTRONOMICAL TWILIGHT
The time after nautical twilight has commenced and when the sky is dark enough, away from the sun's location, to allow astronomical work to proceed. It ends when the center of the sun is 18° below the horizon.
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Meteorology INDEX:
List of Terms: Terms beginning with "A", Page 1 |
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Page Number:
1 2 3 4 5 A: Page 1 of 5.
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