Hacker News Reader

Isn't Newton's birthday January 4th, but was December 25th in their calendar back in the day? Or is it the other way around?

View on HN

You are correct. He was born December 25th, 1642 as per the Julian calendar and January 4th, 1643 as per the Gregorian calendar that almost everyone uses today.

Reply on news.ycombinator.com