Isaac Newton’s birthday

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Isaac Newton was born on January 4, 1643, according to the Gregorian calendar, which is currently in use worldwide. However, at the time of his birth, England was using the Julian calendar, and according to that calendar, his birth date was December 25, 1642. Historians now generally convert the date from the Julian calendar to the Gregorian calendar, which is why Newton's birthday is commonly celebrated on January 4123.
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