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.

VATICAN CITY (CNS) — Three Jesuit astronomers and the 16th-century pope who commissioned the Gregorian calendar have recently been honored with having asteroids named after them.

This is evident in the riot that broke out after England switched from the Julian to the Gregorian Calendar in 1752 and lost eleven days. On the surface, various calendars may seem very different ...

The Gregorian calendar, instituted by Pope Gregory XIII, went into effect in 1582. In the 1,417 years from 1583 through 3000, it’s most common for Easter to fall on April 16, with 61 instances.

It took several hundred years for the Gregorian calendar to be universally adopted — kingdom by kingdom, nation by nation — and there were misadventures along the way. Take Sweden.

Gregorian New Year 1 January 2025 New Year’s Day marks the first day of the Gregorian calendar, something we’ve become fairly familiar with around the world.

Tuesday’s Google Doodle celebrates the 434th anniversary of the Gregorian calendar, which was introduced on Oct. 4, 1582, by Pope Gregory XIII. The new calendar, introduced during the ...