births
January 28, 1540
Ludolph van Ceulen, German-Dutch mathematician and academic (died 1610)
Ludolph van Ceulen
Ludolph van Ceulen was a German-Dutch mathematician from Hildesheim known for the Ludolphine number, his calculation of the mathematical constant pi to 35 digits.
January 28
January 28 is the 28th day of the year in the Gregorian calendar; 337 days remain until the end of the year.