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The Jewish Calendar

Updated on October 23, 2014

Why Do Jewish Holidays Fall on Different Secular Dates?

For those people who don't understand why Jewish holidays fall on different dates (sometimes even different months), I thought I'd discuss the Jewish Calendar so as to demystify the celebration process.

Jewish Months

The Jewish Calendar is Based on a Lunar Model Which Adjusts for the Solar Year

Unlike the secular calendar, the Jewish Calendar is based on the Moon. But, unlike the Muslim calendar, the Jewish calendar adjusts to fit the solar year. This is why holidays fall on different dates, but generally fall during the same time of year, for instance, Passover is also called Hag Ha'Aviv, the Holiday of Spring.

The Jewish calendar is composed of 12 months. These months (starting, generally around September) are:

1) Tishrei

2) Heshvan

3) Kislev

4) Tevet

5) Shevat

6) Adar

7) Nissan

8) Iyar

9) Sivan

10) Tammuz

11) Av

12) Elul

(You can find out more information about a specific month by clicking on the names of the months that are links)

Nissan, which is the month of spring and the month of Passover, is considered the first month in the Tora (the 5 books of Moses -- the first 5 books of the Hebrew Bible) because it is the month that the Children of Israel became a nation.

In order to keep the Jewish calendar from falling behind the solar year, the Jewish calendar provides for 7 leap years (called "Shana M'uberet" or, literally, a pregnant year) every 19 years. The Jewish leap year includes not one leap day (like February 29th on the secular calendar) but an entire leap month. This month is called Adar Sheini or Adar II. Adar II comes after Adar I (making them months 12 and 12a, so to speak).

Because of this 19 year cycle, people who keep track of both secular and religious birthdays often have the dates fall together every 19 years.

On the Jewish calendar, every month has either 29 or 30 days. This is because the cycle of the moon around the earth is 29 1/2 days. In ancient times, witnesses would testify that they saw the new moon and the Jewish court would declare the new month (or Rosh Hodesh -- literally the Head of the Month). But in modern times, the calendar is planned in advance to ensure that certain holidays don't fall on certain days of the week (for example, Yom Kippur cannot fall on Sunday or Friday because observance of the Shabbat, the Sabbath, requires a "25 hour day" and the observance of Yom Kippur also requires a "25 hour day" -- and you can't have two "25 hour days" in a row).

Most months always have either 29 or 30 days every year, but certain months can have either, depending on the year. Kislev, the month during which Hanuka falls, is one such month and, because of this, the date that Hanuka ends is not always the same -- it can end on either the 2nd or 3rd of Tevet.

Sheva Minim (seven fruits of Israel) Water Bottle
Sheva Minim (seven fruits of Israel) Water Bottle | Source

Compugraph Designs Printfection Store (Jewish Holiday themed merchandise)

Compugraph Designs has a store on "Printfection" which includes cutting boards (good wedding or housewarming gifts), mugs and cups, tees, etc.

This water bottle is only one of several Jewish Holiday themed items at our store:

You Don't Have To Be Jewish When You'Re In Love
You Don't Have To Be Jewish When You'Re In Love

This comedy album reminds me of my teenage babysitting days. When I was in High School, I used to babysit for a family in town who had these two albums. I used to listen to them so much that I got to know the "shticks" by heart. Very enjoyable!

 
Source

Printpop Portfolio of Compugraph Designs'

Printpop is another "print on demand" site where Compugraph Designs has a site. They specialize in posters but have other products, too.

Sign my guest book - What did you like about this lens, what didn't you like?

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    • Gypzeerose profile image

      Rose Jones 5 years ago

      Lots of new information here -thanks for putting this all together.

    • profile image

      JoshK47 6 years ago

      Very interesting, informative lens!

    • profile image

      JDater 8 years ago

      Nice site.

    • Paula Atwell profile image

      Paula Atwell 8 years ago from Cleveland, OH

      Welcome to Judaism, Jewish Holidays, and Jewish Culture.

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      anonymous 9 years ago

      I am interested in learning about Jewish Culture since I have been studing to convert. Learning about the High Holy days are top of my list. Appreciate your page