Thursday, Feb. 29 is leap day — that's something you don't hear very often. Here’s what you need to know about the day that happens almost every four years. 🗓️ What is a leap year? A leap year is ...

ROME – Pope Gregory XIII, the 16th century pontiff responsible for what is today known as the Gregorian calendar, now has another, celestial claim to fame. A working group of the International ...

This week is significant, for religious reasons it has not always existed. It was in 1582, Pope Gregory XIII instituted a major reform of the calendar, which has since been almost universally adopted.

ROME -- Pope Gregory XIII, the 16th century pontiff responsible for what is today known as the Gregorian calendar, now has another, celestial claim to fame. A working group of the International ...

The Vatican Observatory announced this week the naming of four newly discovered asteroids after notable Catholics, including Pope Gregory XIII, who began the tradition of papal astronomers and ...

An illustration of Thomas Stukeley kneeling in front of Pope Gregory XIII and Philip II of Spain, who urged him to raise a rebellion against Elizabeth I of England ...

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

The sun sets behind the dome of St. Peter’s Basilica, in Rome, on Feb. 20, 2023. Pope Gregory XIII, the 16th century pontiff responsible for what is today known as the Gregorian calendar, now has ...