A calendar is a system of organizing days for social, spiritual, business, or administrative functions. The commonest kind of calendar is the Gregorian calendar, which is utilized in many of the world. The Gregorian calendar is a photo voltaic calendar, which means that it’s based mostly on the Earth’s orbit across the Solar. The Gregorian calendar has 12 months, with 28 days in February in a typical 12 months and 29 days in February in a bissextile year.
The Gregorian calendar was launched in 1582 by Pope Gregory XIII. It was a modification of the Julian calendar, which had been used since 46 BC. The Julian calendar had a bissextile year each 4 years, however this precipitated the calendar to float out of sync with the Solar. The Gregorian calendar corrected this drift by introducing a extra advanced bissextile year rule.
