Mean solar day - Heikin Taiyou Jitsu (English spelling) mean solar day
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The time from one mean solar noon to the next noon. It also refers to the period of time that begins at noon, i.e. noon, and ends at the next noon, and also refers to the date based on that. Because the sun moves directly along the ecliptic, the mean solar day is longer than the sidereal day, with 1 mean solar day = 1.002738 sidereal days. This length is the basis for determining the length of time. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
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平均太陽の南中から次の南中までの時間。またその南中時すなわち正午に始って次の正午までの1日，またそれによる日付をいう。太陽が黄道上を順行するため，平均太陽日は恒星日より長く，1平均太陽日＝1.002738恒星日である。この長さが，時間の長さを決める基礎になる。
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