The time it takes for the moon to pass the vernal equinox once and then pass the vernal equinox again. The value in 1900 was about 27.32158 days. It is shorter than the sidereal month because the vernal equinox moves backwards a little each year. Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information |
〘名〙 月が春分点を通過してから再び春分点を通過するまでに要する時間。一九〇〇年の値は約二七・三二一五八日。毎年少しずつ春分点が逆行するために恒星月より短い。回帰月。
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