astronomical calendar

An astronomical calendar is a system that tracks time based on the positions and movements of celestial bodies, such as the Earth, Moon, and Sun. It helps us understand the cycles of seasons, months, and years. For example, the Gregorian calendar, commonly used today, is based on the Earth's orbit around the Sun, with a year lasting about 365.25 days. Lunar calendars, like the Islamic calendar, rely on the Moon's phases. Astronomical calendars enable us to predict events like eclipses, solstices, and equinoxes, providing a framework for organizing time in relation to the universe.