Christmas Girls

The December 25 date may have been selected by the church in Rome in the early 4th century. At this time, a church calendar was created and other holidays were also placed on solar dates: "It is cosmic symbolism...which inspired the Church leadership in Rome to elect the winter solstice, December 25, as the birthday of Christ, and the summer solstice as that of John the Baptist, supplemented by the equinoxes as their respective dates of conception. While they were aware that pagans called this day the 'birthday' of Sol Invictus, this did not concern them and it did not play any role in their choice of date for Christmas," according to modern scholar S.E. Hijmans.
However, today, whether or not the birth date of Jesus is on December 25 is not considered to be an important issue in mainstream Christian denominations; rather, celebrating the coming of God into the world in the form of man to atone for the sins of humanity is considered to be the primary meaning of Christmas.
• Using the Julian calendar
Eastern Orthodox national churches, including those of Russia, Georgia, Ukraine, Macedonia, Montenegro, Serbia and the Greek Patriarchate of Jerusalem mark feasts using the older Julian calendar. December 25 on the Julian calendar currently corresponds to January 7 on the internationally-used Gregorian calendar. However, other Orthodox Christians, such as the churches of Greece, Romania, Antioch, Alexandria, Albania, Finland and the Orthodox Church in America, among others, began using the Revised Julian calendar in the early 20th century, which corresponds exactly to the Gregorian calendar. These Orthodox Churches celebrate Christmas on the same day as Western Christianity. Oriental Orthodox churches also use their own calendars, which are generally similar to the Julian calendar. The Armenian Apostolic Church celebrates the nativity in combination with the Feast of the Epiphany on January 6. Armenian churches customarily use the Gregorian calendar, but some use the Julian calendar and thus celebrate Christmas Day on January 19, and Christmas Eve on January 18 (according to the Gregorian calendar).