A 3,500-year-old calendar uses ripening barley to keep the lunar year in sync
The ancient Hebrew calendar maintains perfect accuracy by synchronizing lunar cycles with the ripening of barley, ensuring that seasonal festivals and agricultural harvests remain in harmony over thousands of years.
To keep the lunar year from drifting away from the seasons, this 3,500-year-old system relies on the abib stage of barley. If the grain is not ripe enough to produce a two-liter offering by the spring equinox, an extra month is added to the year. This ensures Passover always aligns with the harvest.
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