Concept

Rosh Chodesh

Summary
In Judaism, Rosh Chodesh or Rosh Hodesh (ראש חודש; trans. Beginning of the Month; lit. Head of the Month) is a minor holiday observed at the beginning of every month in the Hebrew calendar, marked by the birth of a new moon. Rosh Chodesh is observed for either one or two days, depending on whether the previous month contained 29 or 30 days. The Book of Exodus establishes the new moon of Nisan, which is the first month of Aviv, as the beginning of the Hebrew calendar: And the spoke unto Moses and Aaron in the land of Egypt, saying: "This month shall mark for you the beginning of the months; it shall be the first of the months of the year for you." In the Book of Numbers, God speaks of the celebration of the new moon to Moses: And on your joyous occasions—your fixed festivals and new moon days—you shall sound the trumpets over your burnt offerings and your sacrifices of well-being. In , both new and full moon are mentioned as a time of recognition by the Hebrews: Blow the horn on the new moon, on the full moon for our feast day. In the Bible, Rosh Chodesh is often referred to simply as "Chodesh", as the Hebrew word "chodesh" can mean both "month" and "new month". Hebrew calendar Judaism uses a lunisolar calendar, so Rosh Chodesh is celebrated in connection with the date of the new moon. Originally, the date of Rosh Chodesh was confirmed on the testimony of witnesses observing the new moon, a procedure known as kiddush hachodesh (sanctification of the month). After the Sanhedrin declared Rosh Chodesh for either a full (30-day) or defective (29-day) month, news of it would then be communicated throughout Israel and the diaspora. This system was dependent on the functioning of the Sanhedrin to declare the month, and to communicate this month to far-flung Jewish communities. In the 4th century CE, this became impossible and instead a fixed calendar of 29- and 30-day months (see Hebrew calendar for details) was instituted by Hillel II. At the end of a 29-day month, Rosh Chodesh is celebrated for one day, on the first day of the new month.
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