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Julian year - Julian year (English spelling)
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The length of a year in the Julian calendar, i.e. 365.25 days. The length of a solar year is not completely constant due to long-term changes caused by perturbations, so this easy-to-calculate unit is used as the standard for recording astronomical phenomena. It is usually measured starting from noon mean Greenwich time on January 0, 1900 (December 31, 1899). Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
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ユリウス暦における1年の長さ，すなわち 365.25日。1太陽年の長さは，摂動による長年変化のため，完全に一定ではないので，天文現象の記録の基準には計算しやすいこの単位を用いることになっている。通常，1900年1月0日 (1899年 12月 31日) グリニッジ時平均時正午を起点としてはかる。
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>>: Julio-Claudian dynasty - Julius-Claudian dynasty
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