A calendar is a system of organizing days for social, non secular, business, or administrative functions. The commonest kind of calendar is the Gregorian calendar, which is utilized in a lot of the world. The Gregorian calendar is a photo voltaic calendar, that means that it’s primarily based on the Earth’s orbit across the Solar. The Gregorian calendar has 12 months, with 28 days in February in a typical yr 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 triggered the calendar to float out of sync with the Solar. The Gregorian calendar corrected this drift by introducing a extra advanced bissextile year rule.
