from The Century Dictionary and Cyclopedia
- n. The second month of the Jewish civil year, and the eighth of the sacred year, corresponding to the latter part of October and a part of November. It has 29 or 30 days.
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The signs + and - are respectively annexed to Hesvan and Kislev to indicate that the former of these months may sometimes require to have one day more, and the latter sometimes one day less, than the number of days shown in the table -- the result, in every case, being at once determined by the total number of days that the year may happen to contain.
Hesvan (Heshwan) or subtracted from the month Kislev (Kislew), as need arose, in order to keep the months in agreement with the moon; secondly, eight years out of every nineteen were made "embolismic", i.e. an intercalary month seems to have been introduced when necessary, at this point, in order to prevent the 14th day of Nisan from arriving too early.
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