Tishri / תשרי is the first month after the " bourgeois " Jewish calendar and the 7th month after the " religious " calendar. The month of Tishri is always a full month, that is, it will take 30 days and begins in the Gregorian calendar approximately the first third of September and ends in early October (see Jewish Calendar ). The term " Tishri " comes from the Akkadian word tašrītu "beginning" from, indicating its function as the first month. Similarly, " Tishri " is also attested in Ugaritic.
All Jewish month names date from the time of the Babylonian exile. In the Tanakh the term " Tishri " does not occur, it is only from the 7th month or "Month of Etanim " (eg, 1 Kgs 8.2 LUT) of the question. This is apparently the name according to the old ( pre-exilic calendar). " Etanim " are the "strong (water currents) ," that is, in this month begin the rivers, permanently flowing.
In the month of Tishri, the Jewish High Holidays of Rosh Hashanah ( Tishri 15 - 21st ) and Simchat Torah covered ( 1 / 2 Tishrei ), Yom Kippur ( 10 Tishrei ), Sukkot ( 22 Tishrei ) and the Gedaliah fasting on the 3rd of the month (or on the 4th, when the third one is the Sabbath ). The 30th of Tishri is also the first new moon of the month of Cheshvan ( " Rosh Chodesh Cheshvan ").