Famous Birthdays
- Vincenzo Viviani, Italian mathematician (Viviani's theorem), born in Florence, Grand Duchy of Tuscany (now Italy) (d. 1703)
About April 5, 1622
Calendar: Julian 
Day of the Week: Friday
Calendar: Gregorian 
Day of the Week: Tuesday
How Long Ago? 402 years, 3 months and 27 days
Leap Year: No
Star Sign: Aries
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