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A simulated image of the traditionally defined new Moon: the earliest visible waxing crescent (lower right), which signals the start of a new month in many lunar and lunisolar calendars.[1] At new moon, mostly earthlight illuminates the near side of the Moon.[a]

新月（しんげつ）の天文学的定義と世界各地の暦への影響

新月月相朔太陰暦
2026年8月11日続きを読む →