A calendar is a system of organizing days for social, spiritual, industrial, or administrative functions. The calendar may also be used for monitoring occasions, appointments, birthdays, and different necessary dates.
The Gregorian calendar is probably the most extensively used calendar on the planet right now. It was launched in 1582 by Pope Gregory XIII as a modification of the Julian calendar, which had been in use since 46 BC. The Gregorian calendar is a photo voltaic calendar, that means that it’s primarily based on the Earth’s orbit across the solar.