What does civil twilight mean?

civil twilight

Word Rarity Rare

Frequency: Zipf frequency 3.79 in modern English

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noun

Countable; Uncountable

"The shortest civil twilights take place on the 29th of September and the 15th of March, the longest on the 21st of June; the shortest astronomical twilights fall upon the 7th of October and the 6th of March, the longest on the 21st of June"
"Civil twilight, which begins or ends when the Sun's centre is 6° below the horizon."
"Only the brightest stars are visible during civil twilight."

civil twilights (plural)

How to pronounce civil twilight

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