The Hebrew (Lunar-Solar) Calendar

The Jewish calendar is a lunar-solar system: months follow the cycle of the moon, while an occasional leap month keeps the calendar aligned with the solar year — and, crucially, with the agricultural seasons of the Land of Israel. This is not incidental. The Torah commands (Exodus 23:15; 34:18; Deuteronomy 16:1) that Passover and the seven-day holiday of Matzoth fall in the spring month of Aviv (literally, "the ripening of barley"), a description of a specific agricultural moment in the Land of Israel's own growing cycle, not of wherever in the world a Jewish community happened to be living.

A Calendar Anchored to One Land

For centuries, the determination of leap years was made by the central court sitting in the Chamber of Hewn Stone in Jerusalem, based partly on direct observation of local conditions there — including the ripening of barley and the state of the season — even though the resulting calendar would then govern the religious practice of Jewish communities thousands of miles away, from Babylon to Rome. A Jewish farmer in a wholly different climate, growing wholly different crops, nonetheless set the date of his festivals according to conditions in a land he might never see.

The calendar's three pilgrimage festivals are all tied to this same agricultural cycle: Matzoth (the spring barley harvest), Shavuoth (the summer wheat harvest), and Sukkoth (the autumn harvest). Even prayers for rain, recited by Jewish communities worldwide, are often timed to Israel's own rainy season rather than the worshiper's local climate.

A people that continued, for thousands of years and regardless of where they lived, to structure their entire concept of time around the specific agricultural and seasonal rhythms of one particular land was a people who never stopped treating that land as home.