Mithras Temple may align with Rising Sun on December 25

An 1,800 year-old temple dedicated to the god Mithras that is located at Carrawburgh, in northern England, may align with the rising sun on Dec 25. This day was eventually chosen by Christians as the day to celebrate Jesus's birthday. Some scholars believe the Romans celebrated the birth of Mithras on this same day.

https://www.livescience.com/61309-roman-temple-sun-alignment-christ-birth.html