\Jew"ish cal"en*dar\
A lunisolar calendar in use among Hebraic peoples, reckoning
from the year 3761 b. c., the date traditionally given for
the Creation.
Note: It received its present fixed form from Hillel II.
      about 360 a. d. The present names of the months, which
      are Babylonian-Assyrian in origin, replaced older ones,
      Abib, Bul, etc., at the time of the Babylonian Exile.
      Nineteen years constitute a lunar cycle, of which the
      3d, 6th, 8th, 11th, 14th, 17th, and 19th years are leap
      years. The year 5663 [1902-3 a. d.] was the first year
      of the 299th lunar cycle. The common year is said to be
      defective, regular, or perfect (or abundant) according
      as it has 353, 354, or 355 days. The leap year has an
      intercalary month, and a total of 383 (defective), 384
      (regular), or 385 (perfect, or abundant) days. The
      calendar is complicated by various rules providing for
      the harmonious arrangement of festivals, etc., so that
      no simple perpetual calendar can be constructed. The
      following table gives the months in order, with the
      number of days assigned to each. Only three months vary
      in length. They are: Heshvan, which has 30 days in
      perfect years; Kislev, which has 30 days in regular and
      perfect years; and Adar, which has 30 days in leap
      years. The ecclesiastical year commences with Nisan and
      the civil year with Tishri. The date of the first of
      Tishri, or the Jewish New Year, is also given for the
      Jewish years 5661-5696 (1900-1935 a. d.). From these
      tables it is possible to transform any Jewish date into
      Christian, or vice versa, for the years 1900-1935 a. d.
      Months of the Jewish Year. 1 Tishri . . . . . . 30 2
      Heshvan . . . . . 29 (r. & d.) or 30 (p.) 3 Kislev . .
      . . . . 29 (d.) or 30 (r. & p.) 4 Tebet . . . . . . 29
      5 Shebat . . . . . . 30 6 Adar . . . . . . . 29 or 30
      (l.) -- Veadar . . . . . 29 (occuring only in leap
      years) 7 Nisan . . . . . . .30 8 Ivar . . . . . . ..29
      9 Sivan . . . . . . .30 10 Tammux . . . . . . 29 11 Ab
      . . . . . . . . 30 12 Elul . . . . . . ..29 Jewish Year
      a. d.