Some atheists, skeptics and non- believers called to celebrate 'December 25r as Newtomms Day instead of observing Christmas Day, The reason they propose that—

Atheists, skeptics, and non-believers often celebrate 'Newtonmas' on December 25th as a secular alternative to Christmas. The primary reason for this choice is that Sir Isaac Newton was born on December 25, 1642, according to the Julian calendar (Old Style) used in England at the time [1]. While the Gregorian calendar (New Style) places his birth on January 4, 1643, the coincidence of his Julian birth date with the traditional date of Christmas allows secular groups to celebrate science and reason instead of religious tradition. Organizations like the Skeptics Society have popularized this by offering 'Newtonmas' gifts and cards to honor Newton's monumental contributions to physics and mathematics, such as the laws of motion and universal gravitation. This celebration serves as a symbolic counterpoint to the religious holiday, focusing on empirical discovery.

Sources

1. [1] https://www.newtonproject.ox.ac.uk/his-life-and-work-at-a-glance