VATICAN CITY (CNS) -- Celebrating the Week of Prayer for Christian Unity, Pope Francis reaffirmed the Catholic Church’s willingness to accept a proposal for a common date for celebrating Easter in the ...

They initially decided to base it on the solar calendar known as the Julian calendar. Due to miscalculations, the Julian calendar overestimates the solar year by approximately 11 minutes.

Happy February 29! It doesn’t come round very often, so make sure you enjoy it. But why do we have these extra days? Well, if we didn’t, the seasons would ...

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 ...

In 1752, from Sept. 3rd to 13th, people witnessed a unique historical event. Eleven days were cut from the calendar and deleted forever.