astronomical twilight
noun1
The period in which the sun is between 12° and 18° below the horizon in the morning and evening.
Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.
noun
The period in which the sun is between 12° and 18° below the horizon in the morning and evening.
Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.
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