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| Tu B’Shvat 1638 |  | FRI
29 January 1638 14 Shevat 5398 | SHABBAT
30 January 1638 15 Shevat 5398 | | | |
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| Ta’anit Esther (moved) 1638 |  | | THU
25 February 1638 11 Adar 5398 | | | zomRow |
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| Purim 1638 |  | SHABBAT
27 February 1638 13 Adar 5398 | SUN
28 February 1638 14 Adar 5398 | | | |
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| Shushan Purim 1638 |  | SUN
28 February 1638 14 Adar 5398 | MON
1 March 1638 15 Adar 5398 | | | |
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| Pesach 1638 |  | MON
29 March 1638 14 Nissan 5398 | TUE
6 April 1638 22 Nissan 5398 | | | |
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| Lag BaOmer 1638 |  | SHABBAT
1 May 1638 17 Iyar 5398 | SUN
2 May 1638 18 Iyar 5398 | | | |
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| Shavuot 1638 |  | TUE
18 May 1638 5 Sivan 5398 | THU
20 May 1638 7 Sivan 5398 | | | |
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| Tzom Shiva Asar B'Tammuz 1638 |  | | TUE
29 June 1638 17 Tamuz 5398 | | | zomRow |
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| Tzom Tisha B'av 1638 |  | MON
19 July 1638 8 Av 5398 | TUE
20 July 1638 9 Av 5398 | | | zomRow |
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| Rosh Hashanah 1638 |  | WED
8 September 1638 29 Elul 5398 | FRI
10 September 1638 2 Tishrei 5399 | | | |
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| Tzom Gedaliah (moved) 1638 |  | | SUN
12 September 1638 4 Tishrei 5399 | | | zomRow |
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| Yom Kippur 1638 |  | FRI
17 September 1638 9 Tishrei 5399 | SHABBAT
18 September 1638 10 Tishrei 5399 | | | |
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| Sukkot 1638 |  | WED
22 September 1638 14 Tishrei 5399 | WED
29 September 1638 21 Tishrei 5399 | | | |
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| Shemini Atzeret 1638 |  | WED
29 September 1638 21 Tishrei 5399 | THU
30 September 1638 22 Tishrei 5399 | | | |
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| Simchat Torah 1638 |  | THU
30 September 1638 22 Tishrei 5399 | FRI
1 October 1638 23 Tishrei 5399 | | | |
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| Hanukkah 1638 |  | WED
1 December 1638 24 Kislev 5399 | THU
9 December 1638 2 Tevet 5399 | | | |
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| Tzom Asara B'Tevet 1638 |  | | FRI
17 December 1638 10 Tevet 5399 | | | |
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