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单词
julian day
释义
WordReference Random House Unabridged Dictionary of American English © 2024
Jul
′
ian Day
′
,
[
Astron.
]
a serial number equal to the number of days elapsed since January 1, 4713
b.c.,
proposed by Joseph Scaliger in 1582 and used in astronomical calculations:
January 1, 1965, at noon, Greenwich Civil Time, was Julian Day 2,438,762.0. Abbr.:
J.D.
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更新时间:2025/12/12 10:09:25