ROME (AP) — Pope Leo XIV marked the 56th anniversary of man’s arrival on the moon Sunday with a visit to the Vatican ...

To correct this, Gregory convened a commission of experts who fine-tuned the leap-year system, giving us the one we have today. But the Gregorian calendar isn’t the only legacy Pope Gregory left.

Peering at the sunlit skies through a Vatican-owned space telescope and calling the last surviving member of the Apollo 11 spaceflight mission was how Pope Leo XIV celebrated the ...

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 ...