civil twilight

名词 n.
中文释义

英文释义

名词 n.
  1. The period in which the sun is less than six degrees below the horizon in the morning and evening. 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

词形变化

civil twilights plural
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