The Vedic Calendar is an ancient system used in India, based on the lunar cycles and the movements of celestial bodies. It divides the year into twelve months, each corresponding to a lunar cycle, and includes various festivals and rituals that align with agricultural and seasonal changes. This calendar is significant in Hinduism and is used to determine auspicious dates for events like weddings and religious ceremonies. It also features a unique system of time measurement, including tithis (lunar days) and nakshatras (lunar mansions), which guide spiritual practices and daily life.