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  1. The term dark moon describes the last visible crescent of a waning Moon. The duration of a dark moon varies between 1.5 and 3.5 days, depending on its ecliptic latitude. In current astronomical usage, the new moon occurs in the middle of this dark period, when the Moon and Sun are in conjunction. This definition has entered popular usage, so that calendars will typically indicate the date of the "new moon" rather than the "dark moon".
    Dark moon as the 30th division

    The Oxford English Dictionary defines the new moon as "the first visible crescent of the Moon, after conjunction with the Sun". Dark moon is a term used for a waning crescent moon. When the Moon's orbit is divided into … See more

    See also

    Amavasya – Last day of the dark lunar fortnight
    Black moon – Second new moon in a calendar month
    Lunar phase – Shape of the Moon's sunlit portion as viewed from Earth… See more

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