Jacopo Dondi dell'Orologio (1293–1359), doctor and clock-maker at Padua, father of Giovanni
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Seven such reconstructions were built by Peter Haward of Thwaites and Reed, London; examples of these can be found in the Smithsonian Institution and The Time Museum Illinois.
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In the introduction, Dondi writes that his machine was built in accordance with the 13th-century Theorica planetarum of Campano di Novara, and to demonstrate the validity of the descriptions of the motion of heavenly bodies of Aristotle and Avicenna.
Giovanni Dondi dell'Orologio (1330–1388), doctor and clock-maker at Padua, son of Jacopo
In 1371 he served as ambassador to Venice, but after the conflict between Padua and Venice in 1372, joined the University of Pavia, and served as diplomat and scholar until his death in Abbiategrasso on 19 October 1388.