Approximately every three years is an additional month is inserted into the calendar called Adar II. To determine whether a year is a leap year, enter the year number and perform mod 19. If the result is either 0, 3, 6, 8, 11, 14, or 17, then it is a Jewish leap year. For example, 5774 mod 19 is 17, and therefore it is a Jewish leap year.
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