why is christmas day on the 25th of december

Christmas is celebrated on December 25th to commemorate the birth of Jesus Christ, the central figure of Christianity. The exact date of his birth is not known for certain, but it is believed to have occurred sometime in the first century AD. However, the tradition of celebrating Christmas on December 25th originated in the fourth century AD when the Roman Catholic Church officially established it as a religious holiday. Over time, the celebration of Christmas has evolved to include secular customs and traditions that are not necessarily related to the religious aspects of the holiday.