why is christmas day on 25th december

You know, that's a good question. It's actually a pretty recent tradition. Christmas was originally celebrated in the Roman Empire on December 25th, but it wasn't until the 4th century that it became a holiday for Christians. The reason it's celebrated on that day is because it's believed to be the day that Jesus Christ was born. But why December 25th? Well, some people think it was chosen because it was close to the winter solstice, which was already a major holiday in many cultures.