The Byzantine Liturgy is used in the countries which were evangelized from Constantinople, or which came under its influence for any considerable period. Since the Liturgy of St. John Chrysostom has become the normal liturgy of the Byzantine Church, that of St. Basil is now used only ten times a year:

*The five Sundays of [[Great Lent]]

*On the Eves of [[Nativity]] (Christmas) and [[Theophany]]. However, if the [[Great Feasts]] of Nativity or Theophany fall on a Sunday or Monday, the Liturgy of St. Basil is celebrated on the day of the feast, and the Liturgy of St. John Chrysostom is celebrated on the Eve.

*On the [[feast day]] of St. Basil, which in the Byzantine calendar occurs on the first of January (for those churches which follow the traditional [[Julian Calendar]], January 1 falls on January 14 of the [[Gregorian Calendar]]).