Julian Calendar
Greek church
The Dating of Greek Easter—Explained by A Mathematician
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The Greek Orthodox use the calendar devised by Julius Caesar -- the Roman general turned dictator -- versus the calendar tweaked by the Pope.
Culture
Why Orthodox Easter is the Same Day as Catholic Easter This Year
This year Orthodox Christians and the Catholics are celebrating Easter on the same day - but this is not always the case. In fact, there are many distinct reasons why many a year the Orthodox Church celebrates the Resurrection...