Portal:Judaism/holidays/Rosh Chodesh
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Rosh Chodesh is the first day of every month in the Hebrew calendar, marked by the appearance of the new moon. Contrasted with the astronomical definition of new moon - which is not visible to the naked eye - the new moon in the Hebrew calendar is marked by the day and hour that the new crescent is observed. It is considered a minor holiday, akin to the intermediate days of Passover and Sukkot. When a month consists of thirty days, the final day is considered the first day of Rosh Chodesh of the following month.