"'Christianity is filled with examples of sun worship.'
'Excuse me?' the girl in front said. 'I go to church all the time and I don't see much sun worshipping going on!'
'Really? What do you celebrate on December twenty-fifth?'
'Christmas. The birth of Jesus Christ.'
'And yet according to the Bible, Christ was born in March, so what are we doing celebrating in late December?'
Langdon smiled. 'December twenty-fifth, my friends, is the ancient pagan holiday of sol invictus - Unconquered Sun - coinciding with the winter solstice. It's that wonderful time of year when the sun returns, and the days start getting longer.'"