Last Updated
：2025/11/30
Julian day
Noun
Japanese Meaning
ユリウス通日：天文学者や歴史学者が、異なる文化で記録された出来事の比較のために使用する、ユリウス暦に基づいて紀元前4713年1月1日正午（プロレプティック・ユリウス暦）を0として、経過日数を実数で表す日付表記方式
（ plural ）
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A date expressed as a real number of days counted with GMT noon on 1 January 4713 BC in proleptic Julian calendar (November 24, 4714 BC, in the proleptic Gregorian calendar) as zero; used primarily by astronomers and historians to compare events recorded in different cultures.
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Julian day
Astronomers recorded the observation with the Julian day 2459001.5 to ensure precise timing.
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Astronomers recorded the observation with the Julian day 2459001.5 to ensure precise timing.
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