Start of month of Tevet on the Hebrew calendar. Tevet (?????) is the 10th month of the Hebrew year, has 29 days, and corresponds to December or January 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, 7:48-53

https://hebcal.com/h/rosh-chodesh-tevet-2027?uc=ical-jewish-holidays-all