Wiennat

Who should I believe?

Between Dr. Sheldon Lee Cooper who almost never misses, except when he confronts with Dr. Leslie Winkle.

Sheldon: December 25th, 1642. Julian calendar. Sir Issac Newton is born. Jesus, however, was actually born in the summer. His birthday was moved to coincide with the traditional pagan holiday that celebrates the winter solstice with lit fires and slaughtered guts, which frankly sounds like more fun than twelve hours of Church with my mother, followed by fruit cake.

and Google, who once somehow assumed that Confucius has a relationship with barcode.

PS. After some research, no one missed. Dr.Sheldon stated the date is in Julian calendar but Google's is in Gregorian, Jan 4th 1643. Both refer to the same day.