Today is Christmas Eve by the old calendar, and is still celebrated by millions of people around the world, especially in Eastern Europe.
The 6th of January is also the date of the beginning of Koliada, an ancient Slavic winter festival that predates Christianity. The festival is now incorporated into Christmas festivities.
Koliada in the Mogilev region of Belarus at Christmastime in 1903.
The festival in Lviv, Ukraine.