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Egyptian Christians greet men carrying a cross before the arrival of Pope Tawadros II, the 118th pope of the Coptic Church of Egypt, during a midnight Mass on the eve of the Egyptian Orthodox Christmas at St. Mark's Cathedral in Cairo, Egypt, late Sunday, Jan. 6, 2013. (AP Photo/Amr Nabil)

Orthodox Christians celebrate Christmas

Christmas falls on Jan. 7 for Orthodox

Christians that use the old Julian calendar instead of the 16th-century

Gregorian calendar adopted by Catholics and Protestants and commonly

used in secular life around the world.