Adriaan van Roomen, Flemish priest and mathematician (died 1615)

Adriaan van Roomen, also known as Adrianus Romanus, was a mathematician, professor of medicine and medical astrologer from the Duchy of Brabant in the Habsburg Netherlands who was active throughout Central Europe in the late 16th and early 17th centuries. As a mathematician he worked in algebra, trigonometry and geometry; and on the decimal expansion of pi. He solved the Problem of Apollonius using a new method that involved intersecting hyperbolas. He also wrote on the Gregorian calendar reform.

September 29 is the 272nd day of the year in the Gregorian calendar; 93 days remain until the end of the year.