A calendar is a system used to organize and measure time.
Calendars are used to mark important dates and events, such as birthdays, holidays, and appointments.
There are many different types of calendars, including solar calendars, lunar calendars, and lunisolar calendars.
The most widely used calendar in the world is the Gregorian calendar, which is a solar calendar and is based on the movement of the Earth around the Sun.
Many cultures have their own traditional calendars, such as the Chinese and Mayan calendars.
Calendars are often represented as a chart or table, with each day, week, or month marked in a specific way.
Calendars can be found in many forms such as a physical wall or desk calendars, or digital calendar apps on smartphones and computers.
Calendars are used for personal, business and administrative purposes.
Some calendars are used to predict astronomical events, such as eclipses and tides, and for religious and ceremonial purposes.
The study of calendars and timekeeping is known as chronology.
