For many centuries,Christian writers accepted that Christmas was the actual date on which Jesus was born. However, in the early eighteenth century, scholars began proposing alternative explantions. Isaac Newton argued that the date of Chistmas was aelected to correspond with the winter solstice, which in ancient times was marked on december 25. In 1743, German Protestant paul ernst jablonski argued christmas was placed on december 25 to correspond with the roman solar holiday dies natalis solis invicti and was therefore a suggested that the date of christmas was calculated as nine months after the annunciation, the traditional date of the incarnation.