Every four years, an extra day is added to the calendar, But even with leap day, the math doesn't exactly, well, math.

At least, that was the idea. Revolutionary as the Julian calendar was, it wasn't perfect, and fell out of alignment over time. In 1582, Pope Gregory XIII introduced the Gregorian calendar ...

The original Roman calendar divided the year from March to December into 10 months of either 29 or 31 days, based on lunar ...

Well, Christmas has come and gone. All in all, and only speaking for myself, it wasn’t a bad holiday. The celebrations were festive, people seemed to be in a cheerful mood, and the museum ...

Presidents Day is a federal holiday celebrated each year in mid-February to honor past U.S. presidents. Locally, it's part of ...

"I try to keep it running." Bowan is one of the many Orthodox Christians who celebrate the holiday according to the Julian Calendar. A part of his life he's always embraced. "This is what I was ...

Noting that in 2025 the date coincides on the West’s Gregorian calendar and the East’s Julian calendar, Pope Francis said that “I renew my appeal that this coincidence may serve as an appeal to all ...

Pope Francis reaffirms Catholic Church's willingness to accept a common date for Easter in the West and East, highlighting ...

Prior to the Gregorian and even Julian calendars, Roman King Numa Pompilius (715-673 BC) set about creating a calendar with equal-length months, the University of Chicago said. "When Numa ...