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A sacred calendar is a system for organizing time that is deeply intertwined with religious observances and festivals. These calendars are crucial for worshipping communities, marking significant times in the life of the society and the cosmos. They often align with natural cycles like the new moon, solstices, or equinoxes, but also commemorate historical or mythical events central to the religion.12

Many religious calendars are lunisolar, meaning they are based on both the phases of the Moon and the solar year. This requires periodic adjustments, such as adding an intercalary month, to keep the calendar synchronized with the seasons. Examples include the Jewish and Islamic calendars, which have evolved over centuries and continue to be used by religious groups today. These sacred calendars provide a framework for worship, connecting the community to the divine and reinforcing their worldview.3415

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