The modern Hebrew calendar has been designed to ensure that certain holy days and festivals do not fall on certain days of the week. As a result, there are only four possible patterns of days on which festivals can fall. (Note that Jewish days start at sunset of the preceding day indicated in this article.)
Hebrew name | Abbreviation | Translation | English equivalent |
---|---|---|---|
Yom Rishon (יום ראשון) | יום א' | First day | Sunset on Saturday to sunset on Sunday |
Yom Sheni (יום שני) | יום ב' | Second day | Sunset on Sunday to sunset on Monday |
Yom Shlishi (יום שלישי) | יום ג' | Third day | Sunset on Monday to sunset on Tuesday |
Yom Revii (יום רביעי) | יום ד' | Fourth day | Sunset on Tuesday to sunset on Wednesday |
Yom Hamishi (יום חמישי) | יום ה' | Fifth day | Sunset on Wednesday to sunset on Thursday |
Yom Shishi (יום שישי) | יום ו' | Sixth day | Sunset on Thursday to sunset on Friday |
Yom Shabbat (יום שבת) | יום ש' | Sabbath day | Sunset on Friday to sunset on Saturday |
The modern Hebrew calendar has been arranged so that Yom Kippur does not fall on a Friday (Yom Shishi) or Sunday (Yom Rishon), and Hoshana Rabbah does not fall on Shabbat. [1] These rules have been instituted because Shabbat restrictions also apply to Yom Kippur, and if Yom Kippur were to fall on Friday (Yom Shishi), it would not be possible to make necessary preparations for Shabbat, including candle lighting, because the preceding day is Yom Kippur. Similarly, if Yom Kippur fell on a Sunday (Yom Rishon), it would not be possible to make the necessary preparations for Yom Kippur, including candle lighting, because the preceding day is Shabbat. [2] Also, the laws of Shabbat override those of Hoshana Rabbah (the seventh day of Sukkot), so that if Hoshana Rabbah were to fall on Shabbat certain rituals that are a part of Hoshana Rabbah services (such as carrying willows, which is work) could not be performed in that year.
As a consequence, in the case of Yom Kippur, which falls on 10 Tishrei and cannot fall on a Friday or Sunday, the days in Cheshvan and/or Kislev are adjusted so that Rosh Hashanah, which falls on 1 Tishrei, does not fall on a Wednesday (Yom Revii) or Friday (Yom Shishi). And, in the case of Hoshana Rabbah, which falls on 21 Tishrei and cannot fall on a Saturday, Rosh Hashanah cannot be on a Sunday. This leaves only four days on which Rosh Hashanah is allowed to fall: Monday, Tuesday, Thursday and Saturday (i.e. the first, second, or fourth days of the week, or Shabbat), which are also referred as the "four gates" (Hebrew : ארבעה שערים, romanized: arba'a shearim).
Since three arrangements cannot occur within the fixed calendar, most holidays can each occur on one of four possible days.
All the major holy days and festivals fall in the months of Nisan through Tishrei, months one to seven. These months always have the same number of days, alternating 30 and 29. The next two months are Cheshvan and Kislev, months eight and nine. Both or either of these months can have either 29 or 30 days, allowing for adjustments to be made and the schedule in the coming year to be manipulated. (On a regular year, Cheshvan has 29 days and Kislev has 30 days). The months of Tevet and Shevat, months ten and eleven, have 29 and 30 days respectively. Finally, in a regular year the month of Adar has 29 days, while in a leap year Adar I of 30 days is added before the regular Adar, which becomes Adar II of 29 days. The result is that the period from 1 Tevet to 29 Cheshvan is fixed, except that in a leap year Adar I of 30 days is added; and all adjustments are made using 29/30 Cheshvan and/or 29/30 Kislev.
The period from 1 Adar (or Adar II, in leap years) to 29 Cheshvan contains all of the festivals specified in the Bible - Purim (14 Adar), Pesach (15 Nisan), Shavuot (6 Sivan), Rosh Hashanah (1 Tishrei), Yom Kippur (10 Tishrei), Sukkot (15 Tishrei), and Shemini Atzeret (22 Tishrei). This period is fixed, during which no adjustments are made. The result is that all dates from 1 Nisan through 29 (or 30) Cheshvan can each fall on one of four days of the week. Dates during Kislev can fall on any of six days of the week; during Tevet and Shevat, five days; and dates during Adar (or Adar I and II, in leap years) can each fall on one of four days of the week.
Gate | Frequency | Purim | Passover (first day) | Yom HaZikaron | Yom Ha'atzmaut | Shavuot (first day) | 17 Tammuz/ Tisha B'Av | Rosh Hashanah/ Sukkot/ Shmini Atzeret/ (first day) | Yom Kippur | Hanukkah (first day) | 10 Tevet | Tu Bishvat | Purim Katan (only in leap years) | Gate that follows |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | 31.9% | Sun | Tue | Mon* | Tue* | Wed | Tue | Thu | Sat | Wed or Thu | Wed, Thu, or Fri | Tue, Wed, or Thu | Wed or Fri | Gates 1, 3, or 4 |
2 | 28.6% | Tue | Thu | Tue | Wed | Fri | Thu | Sat | Mon | Fri or Sat | Fri or Sun | Thu or Sat | Fri or Sun | Gates 1, 2, or 4 |
3 | 28.0% | Thu | Sat | Wed† | Thu† | Sun | Sun* | Mon | Wed | Sun or Mon | Sun or Tue | Sat or Mon | Sun or Tue | Gates 1, 2, or 3 |
4 | 11.5% | Fri | Sun | Wed‡ | Thu‡ | Mon | Sun | Tue | Thu | Mon | Tue | Mon | Tue | Gates 2 or 3 |
†Pushed back from Thu/Fri ‡Pushed back from Fri/Sat | *Postponed from Shabbat |
With each gate, some unusual effects occur.
Update when Purim comes around during the year with the next occurrence of either gate.
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