Glossary term: 夜
Description: 黑夜是指太陽低於地平線的一段黑暗時間。黑夜從日落持續到日出。在地球的大部分地區，每 24 小時就有一個夜晚。然而，在北極圈以北和南極圈以南，冬至前後會出現極夜持續數月的黑暗期。這些地區在夏至前後沒有則是極晝。
太陽剛剛落到地平線以下的時期稱為黃昏。在黃昏期間，太陽仍能照亮部分天空。黃昏分為三個相等的時段：民用晨昏蒙影（Civil Twilight），航海晨昏蒙影（Nautical Twilight），天文晨昏蒙影（Astronomical Twilight）。民用晨昏蒙影--太陽在地平線下 0 到 6 度時--天空相對明亮，因此通常不需要街道照明等人工照明。航海晨昏蒙影--當太陽位於地平線下 6 至 12 度時--既能看到明亮的星星，天空也足夠明亮，即使在無月之夜也能看到地平線。這樣，水手就可以使用天體導航進行航行。天文晨昏蒙影是指太陽位於地平線下 12 至 18 度的時候。
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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher The translation of this term and its definition is still awaiting approval
This is an automated transliteration of the simplified Chinese translation of this term
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