Start of month of Nisan on the Hebrew calendar. ?????? (transliterated Nisan or Nissan) is the 1st month of the Hebrew year, has 30 days, and corresponds to March or April on the Gregorian calendar. ????? ???????, transliterated Rosh Chodesh 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

Torah: Numbers 28:1-15

https://hebcal.com/h/rosh-chodesh-nisan-2025?uc=ical-jewish-holidays-all