To compensate for this drift, the Jewish calendar uses a month lunar calendar with an extra month occasionally added.
The month of Nissan occurs 11 days earlier each year for two or three years, and then jumps forward 30 days, balancing out the drift. In ancient times, this good dating places in dallas was added by observation: In English, we commonly call it a leap year.
Note that Adar II is the "real" Adar, the one in which Purim is celebrated, the one in which yahrzeits for Adar are observed, the one in which a year-old born in Adar becomes a Bar Mitzvah.
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