A season lasts about three months and usually has three new moons. This is analogous to the Farmers' Almanac definition of a blue moon as the third full moon in a season with four full moons. Ĭalculated in UTC, instances of a second new moon in a calendar month between 20 are: Īnother use of the term is for the third new moon in a season that has four new moons. However, for the Americas the date is still 30 September, making this the second new moon of September. For example, the new moon of T00:11 UTC occurs on 1 October for Europe, Asia and Oceania, making it the first of two new moons in October. The assignment of a calendar date to a new moon, and in which month a second new moon occurs, depends on the time zone. February is too short for a second new moon to occur. This is analogous to the by-month definition of a blue moon as the second full moon in a month. One use of the term is for the occurrence of a second new moon in a calendar month. Definitions, frequency, dates Month with two new moons Among the meanings ascribed to it are these: a second new moon that appears in the same month the third new moon in an astronomical season with four new moons the absence of a new moon in February or the absence of a full moon in February. It is not a term used in astronomy and there is no single accepted definition of it. For other uses, see Black Moon (disambiguation).īlack moon is a name recently (2016) given to various new moons or absences of them, within a year.
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