There is no fixed Jewish holiday that occurs annually on the Gregorian date of September 11th. The perception of a holiday on this date arises because major Jewish High Holy Days, particularly Rosh Hashanah (the Jewish New Year), frequently fall in September. The keyword term itself functions as a noun phrase, with "holiday" as the head noun, modified by "Jewish" and the specific date "sep 11."
The Hebrew calendar is a lunisolar calendar, which means its dates shift relative to the solar-based Gregorian calendar used in most of the world. Consequently, Jewish holidays do not have fixed Gregorian dates. Rosh Hashanah, which marks the beginning of the month of Tishrei, typically occurs in September or October. For instance, in 2018, the second day of Rosh Hashanah coincided with September 11th. This occasional alignment is why a search for a Jewish holiday on this specific date may occur.
In summary, while no Jewish holiday is permanently set on September 11th, the query likely refers to Rosh Hashanah. The coincidence of this significant holiday with the date in certain years has created an association. Understanding the keyword as a noun phrase helps clarify that the user is searching for a specific event (a holiday) associated with a particular time and cultural context.
