Hebrew Calendar


Jewish Year


The months of the Jewish year are lunar in nature. Unlike the months of the Gregorian solar year that is the norm in the world today, the months of the Jewish year reflect the phases of the moon. This can be seen most clearly in the length of the months. Whereas the months of the Gregorian calendar vary in length between 28 and 31 days in order to make a solar year of 365 (or, in leap years, 366) days, the months of the Jewish year are either 29 or 30 days long. This reflects the fact that a lunar month is 29.5 days in length, and the months always must begin with the new moon.
The Jewish Months (And When They Usually Fall)
Shevat (January-February)
Adar (February-March)
Nisan (March-April)
Iyyar (April-May)
Sivan (May-June)
Tammuz (June-July)
Av (July-August)
Elul (August-September)
Tishrei (September-October)
Heshvan (October-November)
Kislev (November-December)
Tevet (December-January)

Adjustments and Leap Years
A year of 12 lunar months is 11 days shorter than a solar year. To ensure that holidays in the Jewish calendar continue to occur at the correct season, traditionally ascribed to Rabbi Hillel II in the fourth century CE, developed a lunar-solar year. He inserted a leap month at the end of the year seven times in every 19-year cycle.
In order to further fine-tune their calculations, the rabbis determined that the months of Nisan, Sivan, Av, Tishrei, and Shevat are always 30 days long. Iyyar, Tammuz, Elul, Tevet and Adar are always 29 days long. Heshvan and Kislev are either 29 or 30 days in length. In a leap year, there are two months of Adar. When that occurs, Adar I is 30 days long, and Adar II 29. A short Jewish year, therefore, consists of 353 to 355 days, while a leap year varies between 383 and 385 days.
Babylonian Origins of the Months’ Names
Jewish months are Babylonian in origin.
Rosh Chodesh, The New Moon
The Jewish month begins with the new moon, the Rosh Chodesh. There are special prayers associated with the beginning of the month, and Rosh Chodesh ceremonies have oftentimes played an important role particularly among the female members of the Jewish community.
Religious Year
Similar to fiscal years, there are four Jewish years in a year. Rosh Hashanah fall in Tishrei; the new harvest is the 14th of Nissan.
The year of the Trees falls on the ninth of Av. (Tu B’shvat)
The year of Taxation
Resh Lakish said “On the first of Adar, an announcement is made concerning the Shekalim.” (Masechet Megillah)
The first of the Four Special Shabbatot is Shabbat Parshat Shekalim. It occurs either on the last Shabbat of the month of Shevat, or on the Shabbat which in that year coincides with Rosh Chodesh Adar.
Harvest Year
Fifteenth of Nisan (Passover) celebrates the reaping of the first barley an the planting of the wheat. 
Jewish Virtual Library
https://www.jewishvirtuallibrary.org

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