Tycho Brahe, Danish astronomer and alchemist (born 1546)

Tycho Brahe, generally called Tycho for short, was a Danish astronomer of the Renaissance, known for his comprehensive and unprecedentedly accurate astronomical observations. He was known during his lifetime as an astronomer, astrologer, and alchemist. He was the last major astronomer before the invention of the telescope. Tycho Brahe has also been described as the greatest pre-telescopic astronomer.

October 24 is the 297th day of the year in the Gregorian calendar; 68 days remain until the end of the year.