Why is Christmas Day on the 25th December?

Most of the world uses the ‘Gregorian Calendar’ implemented by Pope Gregory XIII in 1582. Before that the ‘Roman’ or Julian Calendar was used (named after Julius Caesar). The Gregorian calendar is more accurate that the Roman calendar which had too many days in a year! When the switch was made 10 days were lost, so that the day that followed the 4th October 1582 was 15th October 1582!

Many Orthodox and Coptic Churches still use the Julian Calendar and so celebrate Christmas on the 7th January. And the Armenian Church celebrates it on the 6th January! In some part of the UK, January 6th is still called ‘Old Christmas’ as this would have been the day that Christmas would have celebrated on, if the calendar hadn’t been changed. Some people didn’t want to use the new calendar as they thought it ‘cheated’ them out of 10 days!

Christians believe that Jesus is the light of the world, so the early Christians thought that this was the right time to celebrate the birth of Jesus. They also took over some of the customs from the Winter Solstice and gave them Christian meanings, like Holly, Mistletoe and even Christmas Carols!

St. Augustine was the person who really started Christmas in the UK by introducing Christianity in the 6th century. He came from countries that used the Roman Calendar, so western countries celebrate Christmas on the 25th December. Then people from Britain and Western Europe took Christmas on the 25th December all over the world!

The name ‘Christmas‘ comes from the Mass of Christ (or Jesus). A Mass service (which is sometimes called Communion or Eucharist) is where Christians remember that Jesus died for us and then came back to life. The ‘Christ-Mass’ service was the only one that was allowed to take place after sunset (and before sunrise the next day), so people had it at Midnight! So we get the name Christ-Mass, shortened to Christmas.