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Category: Appointed Times

The New Moon

Tags:  new moon

(Excerpts Condensed from Torah Club Volume Five)

The first day of the biblical month is called Rosh Chodesh (ראש חדש), which literally means 'a new head' and is understood to mean the 'first of the New Month.' A Rosh Chodesh occurs when the first crescent of the New Moon appears in the sky. Note that the biblical Rosh Chodesh is not the same as the English "New Moon." Rather the Rosh Chodesh moon is ordinarily the first visible crescent of the new lunar cycle.

The middle of the biblical month is a full moon. The end of the biblical month occurs when the moon disappears completely from the sky.

Most of the Ancient Near East determined their calendars according to the lunar phases. In that regard, Israel was not unique.

In the Torah, the commandment of identifying and declaring the new moon was addressed only to Moses and Aaron (Exodus 12). Were it addressed to the entire community, the determination of the calendar would be arbitrary and subject to all sorts of discrepancies. For that reason, this commandment has always been regarded as a function of the Sanhedrin, i.e. the leadership of Israel.1

However, in the Fourth Century, the Roman government officially forbade the Sanhedrin from convening and determining the New Moon. The Jewish community throughout the diaspora was left to their own devices for determining the calendar. The result was uncertainty over festival days, discord between communities and general chaos. A cloudy day could change the day one celebrates Passover! As a result, the method of determining the moon by observation alone fell into disuse. Astronomical projections were made to fix the calendar in advance. Rabbi Hillel II created a fixed calendar that all Israel could use.

The advent of the Rosh Chodesh is customarily announced in the synagogue on the Shabbat before it occurs. This tradition arose in ancient times as a ...

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