intercalation

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Related to Intercalary month: Embolismic month, Kipah
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Synonyms for intercalation

an insertion into a calendar

References in periodicals archive ?
In six of the seven intercalary years, the intercalary month followed the last ordinary month of the year as Addaru II.
Because solar years cannot be evenly divided into lunar months, an extra embolismic or intercalary month must be added to prevent the starting date of the lunar cycles from "drifting" away from the spring season.
The standard practice at Athens was that when an intercalary month was needed it was generally done by a repetition of month 6, Posideon (though this appears not to be exclusively the case (Pritchett 2001: 1-40)).
An intercalary month, or adhimasa, was from time to time added to
60, which reports that nobles of Babylon and Borsippa have had to travel to the Assyrian king to find Out whether he has declared an intercalary month in order to know if they can begin to celebrate Babylon's major religious festival.