There is no fixed Jewish holiday that occurs annually on September 11th. The phrase "september 11 jewish holiday" is a noun phrase that refers to a non-existent observance. Jewish holidays are determined by the Hebrew calendar, a lunisolar calendar, which causes their dates on the Gregorian (civil) calendar to vary from year to year. Therefore, no Jewish holiday is permanently associated with the specific date of September 11.
The major Jewish holidays that typically occur in the autumn, and therefore sometimes fall in September, are Rosh Hashanah (the Jewish New Year) and Yom Kippur (the Day of Atonement). Due to the discrepancy between the Hebrew and Gregorian calendars, the dates for these holidays shift annually. For instance, Rosh Hashanah has occasionally coincided with or included September 11. However, this is a matter of coincidence based on the calendar alignment for that particular year, not a fixed commemoration. On the date of the attacks, September 11, 2001, the corresponding date on the Hebrew calendar was 23 Elul 5761, which was a regular weekday, not a religious holiday.
In conclusion, any association between September 11 and a Jewish holiday is coincidental and temporary, arising from the interaction of two different calendar systems. The query itself points to a common misunderstanding between the fixed nature of the Gregorian calendar date and the fluctuating dates of the Hebrew religious calendar. The relationship is one of occasional overlap rather than a designated, recurring observance.
