Last Updated
：2025/11/20
synodic month
Noun
Japanese Meaning
約29.53日間の月の満ち欠け周期、すなわち同じ月相（例：新月）が再発するまでの期間。 / 平均すると29日12時間44分2.8秒程度の期間を指し、天文観測における月の周期の1つ。
（ plural ）
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a month of approximately 29.53 days, measured from a lunar phase until the return of that same phase. The long-term average duration is 29.530 588 days (29 d 12 h 44 min 2.8 s), or about 29 ½ days.
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synodic month
Astronomers often compare the synodic month to the tropical month when modeling lunar phases for calendars.
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Astronomers often compare the synodic month to the tropical month when modeling lunar phases for calendars.
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