March 14 (3/14) is a day for celebrating the mathematical constant of pi, which starts with the digits 3.14. But the numbering coincidence isn’t the only reason to recognize this day. Join us as we stroll through history to revisit auspicious events that happened on Pi Days past.
Inventor Eli Whitney revolutionized cotton processing with his creation of the cotton gin, a machine that separates usable cotton fiber from seeds. Whitney got a patent for his invention on March 14, 1794. This patent drawing shows an illustration of the gin and includes the date on the right side.
First published March 14, 2017.
Update, March 13, 2018: Adds more March 14 events.
Update, March 14, 2018: Adds the death of Stephen Hawking
Caption by Amanda Kooser / Photo by National Archives and Records Administration