Verse:Irta/Trician Jewish calendar
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One Trician lunar month is 30.58122882574347 Trician days long; hence months in the lunar calendar usually have either 30 or 31 days. Twelve lunar months are about 366.97474590892164 days, which exceeds the solar year by 9.89409312183100 solar days. Hence the Trician Jewish calendar removes a month, approximately once in every 3 years, to keep the months aligned with the solar year.