Holiday Day of Week Chart

Year 10640

Possible This year (10640) Never
Rosh Hashanah ראש השנה
Oct 5, 6879
S
M
T
W
T
F
Sh
Yom Kippur יום כיפור
Oct 14, 6879
S
M
T
W
T
F
Sh
Sukkos סוכות
S
M
T
W
T
F
Sh
Hoshana Rabba הושענא רבה
S
M
T
W
T
F
Sh
Shemini Atzeres שמיני עצרת
S
M
T
W
T
F
Sh
Simchas Torah שמחת תורה
S
M
T
W
T
F
Sh
Chanukah חנוכה
Dec 28, 6879
S
M
T
W
T
F
Sh
Tu BiShvat ט״ו בשבט
Feb 15, 6880
S
M
T
W
T
F
Sh
Purim פורים
Apr 14, 6880
S
M
T
W
T
F
Sh
Pesach פסח
S
M
T
W
T
F
Sh
Shavuos שבועות
Jul 3, 6880
S
M
T
W
T
F
Sh
17 Tammuz י״ז בתמוז
S
M
T
W
T
F
Sh
Tisha B'Av תשעה באב
Sep 3, 6880
S
M
T
W
T
F
Sh

How does this work?

The Jewish calendar follows fixed arithmetic rules that determine which day of the week each holiday can fall on. There are exactly 14 possible year types (keviyot / קביעות), each determining the day of the week for every holiday in that year.

Lo ADU — לא אד״ו

Rosh Hashanah never falls on Sunday, Wednesday, or Friday. This prevents Yom Kippur from being adjacent to Shabbos and Hoshana Rabba from falling on Shabbos.

Lo BaDU — לא בד״ו

Pesach never falls on Monday, Wednesday, or Friday. This is a mathematical consequence of Lo ADU combined with the structure of the year.

AT BASH — א״ת ב״ש

A mnemonic pairing holidays that always fall on the same day of the week: Tisha B'Av = 1st day Pesach, Shavuos = 2nd day Pesach, Rosh Hashanah = 3rd day Pesach, Simchas Torah = 4th day Pesach, Yom Kippur = 5th day Pesach, Purim (previous) = 6th day Pesach.

Holiday Details for 10640

Rosh Hashanah א׳ תשרי
Thursday
Oct 5, 6879
Yom Kippur י׳ תשרי
Saturday
Oct 14, 6879
Sukkos ט״ו תשרי
Hoshana Rabba כ״א תשרי
Shemini Atzeres כ״ב תשרי
Simchas Torah כ״ג תשרי
Chanukah כ״ה כסלו
Thursday
Dec 28, 6879
Tu BiShvat ט״ו שבט
Thursday
Feb 15, 6880
Purim י״ד אדר
Sunday
Apr 14, 6880
Pesach ט״ו ניסן
Shavuos ו׳ סיון
Wednesday
Jul 3, 6880
17 Tammuz י״ז תמוז
Tisha B'Av ט׳ אב
Tuesday
Sep 3, 6880