The date of Easter and its related holidays also depend on if you’re Eastern Orthodox or not. The Eastern Orthodox Church uses the Julian calendar, a solar calendar that was used by the Roman ...

The holiday is referred to as "old" or "Orthodox" as it hails back to a time when Russian and Eastern European governments used the Julian calendar, which is still used by some jurisdictions of ...

Easter’s changing date is an issue that began long before the Gregorian calendar (named after Pope Gregory XIII) was instituted in 1582. (The Julian calendar—named for Julius Caesar—was the ...

Thursday (Feb. 29) is "leap day," an artifact that dates back to the year 46 B.C. Find out how this calendar oddity came to be.