[Noun] (Julius is named after Gaius Julius Caesar) A day counted from Greenwich mean noon on January 1, 4713 BC. Invented by Scaliger in 1582, it is used in chronology and astronomy. Abbreviation JD For example, 9:00 pm on January 1, 2006 Japan time (12:00 on January 1, Greenwich time) is 2453737 JD. Julian day. Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information |
〘名〙 (ユリウスは Julius ガイウス=ユリウス=カエサルの名にちなむ) 紀元前四七一三年一月一日グリニッジ平均正午を起点として数えた通日。一五八二年スカリゲルの創案したもので、年代学・天文学などで用いる。略号 J.D. たとえば日本時の二〇〇六年一月一日午後九時(一月一日一二時グリニッジ時)は二四五三七三七JDとなる。ユリウス通日(つうじつ)。
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