Asteroid named after pope behind Gregorian calendar reform ROME (AP) — Pope Gregory XIII, the 16th century pontiff responsible for the Gregorian calendar, now has another celestial claim to fame.

When the Julian calendar was later refined into the Gregorian calendar in 1582, the tradition of adding a leap day to February persisted. John Tufts covers trending news for the Indianapolis Star.

Due to the complexities of the various types of calendars, the date of Easter can be as early as March 22 and as late as April 25. Here's why.

Solar calendars track the position of the sun in the sky and are used by much of the world today in the form of the Gregorian Calendar. Lunar calendars track the phases of the moon.

It didn’t work out. France switched back to the Gregorian calendar 12 years later. The Soviet Union tried its hand at a new calendar in 1929. The state shrunk the week to five days in a dual effort to ...

The Gregorian calendar is an accurate measurement of time, but according to Johns Hopkins professors Steve Hanke and Richard Conn Henry, it creates a whole host of other problems.

Thursday (Feb. 29) is "leap day," an artifact that dates back to the year 46 B.C. Find out how this calendar oddity came to be.

The Gregorian calendar has 12 months, just like its predecessor, the Julian calendar. The months are January, February, March, April, May, June, July, August, September, October, November, and ...

It’s 2020 in the Gregorian calendar, but here’s what year it is in other calendars: Calendar Current year Assyrian 6770Buddhist 2563Chinese 4717Persian 1398Islamic 1441Mayan 13.0.7.5.2Hebrew 5780 ...

The switch acknowledged that even though he was born Feb. 11, 1731, according to the Julian calendar, to most of the world (which was using the Gregorian calendar), it was Feb. 22, 1732. Advertisement ...