Jebus... okay, I think I got it. Newton was born on December 25th (Julian Calendar) in 1642.
In
1752 England switched to the Gregorian Calendar by skipping ahead 11 days. December 25th (Julian) -> January 4th (Gregorian) the following year. So he
was born on what
was Xmas day, and what some still celebrate as Xmas Day. But on our calendar, it is January 4th.
More interestingly, there are 12 days between through the two... the 12 Days of Christmas? The song dates back to the 18th century if I'm not mistaken.
prepares for bilby fact check
Yeah, Nah; The twelve days of Christmas is a totally unrelated phenomenon. The twelve day holiday pre-dates the song by many centuries, and marks the twelve day gap* between Jesus's birth with no known father, and the arrival of three rich blokes with valuable presents for the baby, (which apparently isn't suspicious
at all).
In medieval Europe, there was little work possible in midwinter, so a long holiday for the peasants, particularly if that meant they didn't need to be paid, seemed like an excellent idea.
And as mentioned, Newton was born on Christmas Day, December 25th, 1642. That was the date everyone present at his birth would have agreed it was, from the midwife, to the free magnet from a local Real Estate Agent on his mum's fridge.
That we
now call that date January 4th, 1643, is due to modern people having a pathological aversion to a discontinuous or ambiguous calendar, which I blame on the computer.
We should probably go back to the medieval practice of describing dates with reference to how many years a particular King has been on the throne of England (counted either from his accession or his coronation, but nobody ever says which they are using), and the number of days since some highly obscure and disputed saint's feast day (often a day that falls on a different date each year, like Easter), with the year starting on either January 1st, or March 25th, or December 25th, but rarely specified because 'it is obvious and everybody knows it'.
* The Magi didn't get to Bethlehem in time for the birth, because the bus drivers were on strike demanding penalty rates for working at Christmas time, and the holiday traffic on the roads was gridlocked. Acording to the Christmas cards, it had also snowed heavily in Bethlehem for the only time in recorded history.