Is it Isaac Newton's birthday or not?
He was born on December 25, 1642 - as dates were then reckoned in England.
Some years after his death, the calendar system was revised. By this new system he was retroactively born on January 4, 1643.
So I guess we can celebrate his birthday twice.
When calendars are re-reckoned
You get one birthday - and then a second.
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