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| Tu B’Shvat 1866 |  | TUE
30 January 1866 14 Shevat 5626 | WED
31 January 1866 15 Shevat 5626 | | | |
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| Ta’anit Esther 1866 |  | | WED
28 February 1866 13 Adar 5626 | | | |
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| Purim 1866 |  | WED
28 February 1866 13 Adar 5626 | THU
1 March 1866 14 Adar 5626 | | | |
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| Shushan Purim 1866 |  | THU
1 March 1866 14 Adar 5626 | FRI
2 March 1866 15 Adar 5626 | | | |
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| Pesach 1866 |  | FRI
30 March 1866 14 Nissan 5626 | FRI
6 April 1866 21 Nissan 5626 | | | |
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| Lag BaOmer 1866 |  | WED
2 May 1866 17 Iyar 5626 | THU
3 May 1866 18 Iyar 5626 | | | |
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| Shavuot 1866 |  | SHABBAT
19 May 1866 5 Sivan 5626 | SUN
20 May 1866 6 Sivan 5626 | | | |
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| Tzom Shiva Asar B'Tammuz 1866 |  | | SUN
1 July 1866 18 Tamuz 5626 | | | zomRow |
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| Tzom Tisha B'av (moved) 1866 |  | SHABBAT
21 July 1866 9 Av 5626 | SUN
22 July 1866 10 Av 5626 | | | zomRow |
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| Rosh Hashanah 1866 |  | SUN
9 September 1866 29 Elul 5626 | TUE
11 September 1866 2 Tishrei 5627 | | | |
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| Tzom Gedaliah 1866 |  | | WED
12 September 1866 3 Tishrei 5627 | | | |
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| Yom Kippur 1866 |  | TUE
18 September 1866 9 Tishrei 5627 | WED
19 September 1866 10 Tishrei 5627 | | | |
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| Sukkot 1866 |  | SUN
23 September 1866 14 Tishrei 5627 | SUN
30 September 1866 21 Tishrei 5627 | | | |
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| Simchat Torah 1866 |  | SUN
30 September 1866 21 Tishrei 5627 | MON
1 October 1866 22 Tishrei 5627 | | | |
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| Hanukkah 1866 |  | SUN
2 December 1866 24 Kislev 5627 | MON
10 December 1866 2 Tevet 5627 | | | |
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| Tzom Asara B'Tevet 1866 |  | | TUE
18 December 1866 10 Tevet 5627 | | | |
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