Inicio del mes de Av en el calendario hebreo. Av (אָב) is the 5° month of the Hebrew year, has 30 days, and corresponds to July or August on the Gregorian calendar. רֹאשׁ חוֹדֶשׁ, transliterated Rosh Jodesh or Rosh Hodesh, is a minor holiday that occurs at the beginning of every month in the Hebrew calendar. It is marked by the birth of a new moon
Haftarah: Ieshaiahu 66:1 - 66:24

https://www.hebcal.com/holidays/rosh-chodesh-av-2021?utm_source=js&utm_medium=icalendar