why does russia celebrate christmas on january 7th

Ah, yes, Russia does have a unique tradition of celebrating Christmas on January 7th instead of December 25th. This is because Russia follows the Julian calendar, which was used by the Byzantine Empire and Russia until the 20th century. The Julian calendar is 13 days behind the Gregorian calendar, which is the calendar used in most countries today. So, Russia celebrates Christmas on January 7th because that is the date that corresponds to December 25th on the Julian calendar.