The venue location in Belém is ideal to remember Pedro Nunes (Petrus Nonius 1502 - 1579). Among many other things, Nunes studied geometrical problems relevant to navigation, such as the properties of rhumb lines or the duration of twilight for any given latitude.

He is best known as the inventor of the nonius, a system that allowed to perform high precision angular measurements in nautical instruments, such as the astrolabe or the quadrant.

Being interested in theoretical and measurement aspects of geometry, Pedro Nunes could have become a Euclid member today!