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单词 astronomical day
释义

Definition of astronomical day in English:

astronomical day

noun

  • A day of 24 hours, especially (until 31 December 1924) one beginning at noon in the middle of the corresponding civil day; (after that date) one beginning at the previous midnight, as with the civil day.

Origin

Mid 17th century; earliest use found in George Walker (d. 1690), Church of Ireland clergyman.

Definition of astronomical day in US English:

astronomical day

noun

  • A day of 24 hours, especially (until 31 December 1924) one beginning at noon in the middle of the corresponding civil day; (after that date) one beginning at the previous midnight, as with the civil day.

Origin

Mid 17th century; earliest use found in George Walker (d. 1690), Church of Ireland clergyman.
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更新时间：2025/6/19 22:30:21