While people in many parts of the world celebrate Christmas Day on 25 December, for Orthodox people across the Arab world - such as Egyptian Copts and most Armenians, Assyrians, and Arab Christians - Christmas actually falls on January 7. This is because most Orthodox Christian groups follow the eastern liturgical calendar - which is based on the Julian calendar created by the Romans, rather than the Gregorian calendar that other Christian groups have followed since 1582. This means dates of sev