Built over a period of 16 years, the Astrarium was considered a mechanical miracle of the Middle Ages, utilizing 107 moving parts to synchronize these various astronomical and temporal displays.
Because Dondi wasn’t trying to tell time . He was trying to in real-time, gears, and pointers. In the geocentric model, each planet moves on a series of circles (deferent, epicycle, equant). To know a planet’s true position in the sky, you need to know several simultaneous motions: Built over a period of 16 years, the
This face was used for the standard telling of time. and pointers. In the geocentric model