Days of week on Hebrew calendar

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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.)

Contents

Hebrew week days

Hebrew nameAbbreviationTranslationEnglish equivalent
Yom Rishon (יום ראשון)יום א'First day Sunset on Saturday to sunset on Sunday
Yom Sheni (יום שני)יום ב'Second daySunset on Sunday to sunset on Monday
Yom Shlishi (יום שלישי)יום ג'Third daySunset on Monday to sunset on Tuesday
Yom Revii (יום רביעי)יום ד'Fourth daySunset on Tuesday to sunset on Wednesday
Yom Hamishi (יום חמישי)יום ה'Fifth daySunset on Wednesday to sunset on Thursday
Yom Shishi (יום שישי)יום ו'Sixth daySunset on Thursday to sunset on Friday
Yom Shabbat (יום שבת)יום ש'Sabbath daySunset on Friday to sunset on Saturday

Reasons

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).

The four gates

Since three arrangements cannot occur within the fixed calendar, most holidays can each occur on one of four possible days.

All the 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.

GateFrequency 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
131.9%SunTueMon*Tue*WedTueThuSatWed or ThuWed, Thu, or FriTue, Wed, or ThuWed or FriGates 1, 3, or 4
228.6%TueThuTueWedFriThuSatMonFri or SatFri or SunThu or SatFri or SunGates 1, 2, or 4
328.0%ThuSatWed†Thu†SunSun*MonWedSun or MonSun or TueSat or MonSun or TueGates 1, 2, or 3
411.5%FriSunWed‡Thu‡MonSunTueThuMonTueMonTueGates 2 or 3
†Pushed back from Thu/Fri
‡Pushed back from Fri/Sat
*Postponed from Shabbat

*Postponed to not fall on Shabbat

With each gate, some unusual effects occur.

Gate 1 (31.9%)

Gate 2 (28.6%)

Gate 3 (28.0%)

Gate 4 (11.5%)

Next occurrence of each gate

Update when Purim comes around during the year with the next occurrence of either gate.

Sources

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References

  1. This is the reason given by most halachic authorities, based on the Talmud, Rosh Hashanah 20b and Sukkah 43b. Maimonides (Mishneh Torah, Kiddush Hachodesh 7:7), however, writes that the arrangement was made (possible days alternating with impossible ones) in order to average out the difference between the mean and true lunar conjunctions.
  2. The Talmud (Rosh Hashanah 20b) puts it differently: over two consecutive days of full Shabbat restrictions, vegetables would wilt (since they can't be cooked), and unburied corpses would putrefy.