Georg Mohr, Danish mathematician and theorist (born 1640)

Jørgen Mohr was a Danish mathematician, known for being the first to prove the Mohr–Mascheroni theorem, which states that any geometric construction which can be done with compass and straightedge can also be done with compasses alone.

January 26 is the 26th day of the year in the Gregorian calendar; 339 days remain until the end of the year.