The Jewish Calendar

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Why Do Jewish Holidays Fall on Different Secular Dates?

B"H

So many people don't understand why Jewish holidays fall on different dates (sometimes even different months) that I thought a discussion of the Jewish Calendar might 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.

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Vegetarianism: Getting Started 2
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Check out my blogs:

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Some Calendars from Compugraph Designs

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Tora Portion Neck tie designs from Compugraph Designs' on zazzle

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Jewish themed designs from Compugraph Designs' on zazzle

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What did you like about this lens, what didn't you like?

  • JoshK47 Mar 11, 2011 @ 8:59 am | delete
    Very interesting, informative lens!
  • JDater May 7, 2009 @ 5:16 am | delete
    Nice site.
  • lakeerieartists Nov 28, 2008 @ 3:50 pm | delete
    Welcome to Judaism, Jewish Holidays, and Jewish Culture.
  • Peggy Smith May 21, 2008 @ 12:58 am | delete
    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

Amazon products about Jewish holidays

More Amazon products related to Jewish holidays

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Jewish products from Amazon

(The first book was written by a friend of mine)

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Compugraph Designs Printfection Store (Jewish Holiday themed merchandise)

<i>Sheva Minim</i> (seven fruits of Israel) Water BottleIn addition to our Cafe Press and Zazzle sites (see modules above), we also have 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:

Compugraphd Printfection site

(Click on the picture to go directly to this product's page)

Printpop Portfolio of Compugraph Designs'

I just discovered Printpop -- check out my entire portfolio or click on the graphic to see just this product (called "Jewish Star Centered"). Check back periodically as new designs are uploaded.

Compugraph Designs' Printfection Store (Jewish Holidays)

Shabbat Shalom Cutting BoardIn addition to our Cafe Press and Zazzle sites (see modules above), we also have a store on "Printfection" which includes cutting boards (good wedding or housewarming gifts), mugs and cups, tees, etc.

This cutting board is only one of several Jewish holiday themed items at our store:

Compugraphd Printfection site

(Click on the picture to go directly to this product's page)

Compugraph Designs Printfection Store (Judaica themed merchandise)

Jewish Star/Menora Frosted Glass SteinIn addition to our Cafe Press and Zazzle sites (see modules above), we also have a store on "Printfection" which includes cutting boards (good wedding or housewarming gifts), mugs and cups, tees, etc.

This stein is only one of several Jewish themed items at our store:

Compugraphd Printfection site

(Click on the picture to go directly to this product's page)

Jewish Family Services merchandise on Zazzle

Help support Jewish Family and Vocational Services by buying their merchandise from Zazzle.
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Other Jewish Calendar Themed Lenses from compugraphd

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compugraphd

B"H Hi -- I'm a graphic artist from NJ. I have been designing since I was in High School (the margins of my notebooks have all sorts of pictures including... more »

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