Orthodox Christmas Day is celebrated by Orthodox Christians around the world. The difference in date from the December 25 celebration of Christmas in the Western Christian tradition arises from the use of different calendars.

The Orthodox New Year is also known as the Old New Year. This tradition is observed in many Orthodox Christian countries and communities, particularly those that continue to follow the Julian calendar for religious celebrations.

Theophany, celebrated primarily in Orthodox Christianity, is a feast that commemorates the baptism of Jesus Christ in the Jordan River by John the Baptist. It emphasizes the revelation of the Holy Trinity (Father, Son, and Holy Spirit) at the baptism.