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| Tzom Asara B'Tevet 866 |  | | TUE
5 January 866 10 Tevet 4626 | | | |
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| Tu B’Shvat 866 |  | SUN
7 February 866 14 Shevat 4626 | MON
8 February 866 15 Shevat 4626 | | | |
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| Ta’anit Esther 866 |  | | MON
8 March 866 13 Adar 4626 | | | |
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| Purim 866 |  | MON
8 March 866 13 Adar 4626 | TUE
9 March 866 14 Adar 4626 | | | |
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| Shushan Purim 866 |  | TUE
9 March 866 14 Adar 4626 | WED
10 March 866 15 Adar 4626 | | | |
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| Pesach 866 |  | WED
7 April 866 14 Nissan 4626 | THU
15 April 866 22 Nissan 4626 | | | |
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| Lag BaOmer 866 |  | MON
10 May 866 17 Iyar 4626 | TUE
11 May 866 18 Iyar 4626 | | | |
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| Shavuot 866 |  | THU
27 May 866 5 Sivan 4626 | SHABBAT
29 May 866 7 Sivan 4626 | | | |
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| Tzom Shiva Asar B'Tammuz 866 |  | | THU
8 July 866 17 Tamuz 4626 | | | zomRow |
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| Tzom Tisha B'av 866 |  | WED
28 July 866 8 Av 4626 | THU
29 July 866 9 Av 4626 | | | zomRow |
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| Rosh Hashanah 866 |  | FRI
17 September 866 29 Elul 4626 | SUN
19 September 866 2 Tishrei 4627 | | | |
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| Tzom Gedaliah 866 |  | | MON
20 September 866 3 Tishrei 4627 | | | |
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| Yom Kippur 866 |  | SUN
26 September 866 9 Tishrei 4627 | MON
27 September 866 10 Tishrei 4627 | | | |
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| Sukkot 866 |  | FRI
1 October 866 14 Tishrei 4627 | FRI
8 October 866 21 Tishrei 4627 | | | |
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| Shemini Atzeret 866 |  | FRI
8 October 866 21 Tishrei 4627 | SHABBAT
9 October 866 22 Tishrei 4627 | | | |
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| Simchat Torah 866 |  | SHABBAT
9 October 866 22 Tishrei 4627 | SUN
10 October 866 23 Tishrei 4627 | | | |
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| Hanukkah 866 |  | FRI
10 December 866 24 Kislev 4627 | SHABBAT
18 December 866 2 Tevet 4627 | | | |
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| Tzom Asara B'Tevet 866 |  | | SUN
26 December 866 10 Tevet 4627 | | | |
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