Q&A Home > C > Calendar Because the Coptic Church uses the Julian Calendar, is this why the feast of the Nativity is celebrated on Jan 7th? Is this because it is the original calendar, which was invented by Julius Caesar, but used by the Church and declared by the 1st Ecumenical Council? Regarding the Julian calendar and the reason the Nativity Feast is celebrated on January 7th, this information is correct.
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