The Gregorian calendar, which is probably the most broadly used calendar on the planet in the present day, operates on a cycle of 400 years. Because of this the calendar repeats itself each 400 years. Consequently, the yr 2025 would be the similar because the yr 2425, 2825, and so forth.
The Gregorian calendar was launched in 1582 by Pope Gregory XIII. It was a modification of the Julian calendar, which had been in use since 45 BC. The Julian calendar had a bissextile year each 4 years, however this brought on the calendar to float out of sync with the photo voltaic yr. The Gregorian calendar launched a brand new rule for leap years: a yr is a bissextile year whether it is divisible by 4, however not by 100, until it’s also divisible by 400. This rule ensures that the Gregorian calendar stays in sync with the photo voltaic yr.
