An astrarium, also called a planetarium, is an ancient astronomical clock made in the 14th century by Italian engineer and astronomer Giovanni Dondi dell'Orologio. The Astrarium was modeled after the solar system and, in addition to counting time and representing calendar dates and holidays, showed how the planets moved around the celestial sphere in one timepiece.
An astronomical clock, also called a planetarium, was created in the 14th century by Italian engineer and astronomer Giovanni Dondi dell'Orologio. It was designed to show time, calendar dates, and holidays, while also illustrating how planets move around the celestial sphere within one device.