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| Tu B’Shvat 1666 |  | WED
20 January 1666 14 Shevat 5426 | THU
21 January 1666 15 Shevat 5426 | | | |
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| Ta’anit Esther (moved) 1666 |  | | THU
18 March 1666 11 Adar Bet 5426 | | | zomRow |
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| Purim 1666 |  | SHABBAT
20 March 1666 13 Adar Bet 5426 | SUN
21 March 1666 14 Adar Bet 5426 | | | |
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| Shushan Purim 1666 |  | SUN
21 March 1666 14 Adar Bet 5426 | MON
22 March 1666 15 Adar Bet 5426 | | | |
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| Pesach 1666 |  | MON
19 April 1666 14 Nissan 5426 | TUE
27 April 1666 22 Nissan 5426 | | | |
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| Lag BaOmer 1666 |  | SHABBAT
22 May 1666 17 Iyar 5426 | SUN
23 May 1666 18 Iyar 5426 | | | |
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| Shavuot 1666 |  | TUE
8 June 1666 5 Sivan 5426 | THU
10 June 1666 7 Sivan 5426 | | | |
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| Tzom Shiva Asar B'Tammuz 1666 |  | | TUE
20 July 1666 17 Tamuz 5426 | | | zomRow |
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| Tzom Tisha B'av 1666 |  | MON
9 August 1666 8 Av 5426 | TUE
10 August 1666 9 Av 5426 | | | zomRow |
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| Rosh Hashanah 1666 |  | WED
29 September 1666 29 Elul 5426 | FRI
1 October 1666 2 Tishrei 5427 | | | |
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| Tzom Gedaliah (moved) 1666 |  | | SUN
3 October 1666 4 Tishrei 5427 | | | zomRow |
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| Yom Kippur 1666 |  | FRI
8 October 1666 9 Tishrei 5427 | SHABBAT
9 October 1666 10 Tishrei 5427 | | | |
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| Sukkot 1666 |  | WED
13 October 1666 14 Tishrei 5427 | WED
20 October 1666 21 Tishrei 5427 | | | |
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| Shemini Atzeret 1666 |  | WED
20 October 1666 21 Tishrei 5427 | THU
21 October 1666 22 Tishrei 5427 | | | |
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| Simchat Torah 1666 |  | THU
21 October 1666 22 Tishrei 5427 | FRI
22 October 1666 23 Tishrei 5427 | | | |
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| Hanukkah 1666 |  | TUE
21 December 1666 24 Kislev 5427 | WED
29 December 1666 2 Tevet 5427 | | | |
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