Specific system a religious tradition uses to organize and mark time, including days, months, and years. It encompasses the rules and practices for determining important religious dates, such as festivals, holidays, and seasons of worship. Each Calendar reflects the unique spiritual and cultural heritage of a religion, often aligning with celestial events, historical occurrences, or scriptural narratives. These calendars not only measure time but also deeply influence religious observances, rituals, and the spiritual rhythm of the faithful.