The lunisolar calendar used by certain groups tracing their lineage to the ancient Israelites determines holidays and observances based on the cycles of both the moon and the sun. This calendar system typically begins in the fall, marked by the new moon closest to the autumnal equinox. For example, the beginning of the year might fall in September or early October in the Gregorian calendar. Specific dates for holidays, like Passover and Sukkot, shift annually on the Gregorian calendar due to this lunisolar reckoning.
Maintaining this traditional timekeeping system provides a tangible link to ancestral practices and reinforces a distinct cultural identity. Rooted in ancient agricultural cycles and biblical commandments, this calendar dictates the timing of festivals and sacred days, preserving a continuous thread of tradition across millennia. It serves as a framework for communal life, influencing religious practice and fostering a sense of shared history.