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单词 heliacal rising
释义

Collins Concise English Dictionary © HarperCollins Publishers::
heliacal rising /hɪˈlaɪəkəl/ n
  1. the rising of a celestial object at approximately the same time as the rising of the sun
  2. the date at which such a celestial object first becomes visible in the dawn sky
Etymology: 17th Century: from Late Latin hēliacus relating to the sun, from Greek hēliakos, from hēlios the sun
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更新时间:2025/7/23 8:27:18