Dating for 6 months

The Jewish calendar, however, coordinates all three of these astronomical phenomena.

On average, the moon revolves around the Earth in about 29½ days.Holidays are celebrated on the same day of the Jewish calendar every year, but the Jewish year is not the same length as a solar year on the civil calendar used by most of the western world, so the date shifts on the civil calendar.The Jewish calendar is based on three astronomical phenomena: the rotation of the Earth about its axis (a day); the revolution of the moon about the Earth (a month); and the revolution of the Earth about the sun (a year).In ancient times, the new months used to be determined by observation.When people observed the new moon, they would notify the Sanhedrin.

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