Around 46 BC, Roman emperor Julius Caesar proposed a solution: the Julian calendar. This new 12-month calendar would always consist of 365 days except every fourth year when an additional day was ...

So to account for that residual quarter of a day, an extra day — a leap day — was added to the calendar every four years. This new "Julian" calendar was used throughout the Roman Empire and by ...

But, as Konstantin Bikos, the lead editor at timeanddate.com shared, "The Julian calendar was just not accurate enough. It had a Leap Day every four years, so over the centuries, it slowly drifted ...

The Gregorian calendar was introduced in October 1582 by Pope Gregory XIII as a modification to the Julian calendar, named after Julius Caesar, leader of ancient Rome. The Gregorian and Julian ...

The Synod of the Orthodox Church of Ukraine has approved switching to the new Julian calendar from Sept. 1. It means the Church will celebrate Christmas on Dec. 25 instead of Jan. 7. Other ...

On October 5, 1582, Pope Gregory XIII (1502-85, reigned 1572-85) issued his papal bull Inter gravissimas (In the gravest concern) which modified and replaced the Julian calendar then in general use.