6-22-1389

Giovanni Dondi died. In 1381 he built one of the earliest geared equatoria driven by clockwork. There is a model of it in the Smithsonian. It has a heptagonal frame with a planet on each face. Dials show the time of sunrise, sunset, moveable feasts, and the nodes of the moon orbit.

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Giovanni Dondi
Dondi's Astrarium