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1 Dondi, Giovanni
SUBJECT AREA: Horology[br]b. 1318 Chioggia, Italyd. 22 June 1389 Milan, Italy[br]Italian physician and astronomer who produced an elaborate astronomical clock.[br]Giovanni was the son of Jacopo de'Dondi dall'-Orologio, a physician who designed a public clock that was installed in Padua in 1344. The careers of both father and son followed similar paths, for Giovanni became Physician to Emperor Charles IV and designed a complicated astronomical clock (astrarium) for which he became famous. Around 1350 he was appointed Professor of Astronomy at the University of Padua. Dondi completed his astrarium in 1381, having worked on it for sixteen years. Unlike the clock of Richard of Wallingford, it used the common form of verge escapement and had no facility for sounding the hours on a bell. It did, however, indicate time on a 24- hour dial and had calendars for both the fixed and movable feasts of the Church. Its principal function was to show the motions of the planets on the Ptolemaic theory, i.e. the Sun, Moon, Mercury, Venus, Mars, Jupiter and Saturn. Like the Wallingford clock, it also indicated the position of the nodes, or points where the orbits of the Sun and Moon intersected, so that eclipses could be predicted. The astrarium was acquired by the Duke of Milan and its history can be traced to c.1530, when it was in disrepair. It is now known only from copies of Dondi's manuscript "Tractus astarii". Several modern reconstructions have been made based upon the details in the various manuscripts.[br]Bibliography1987, Astrarium Johannis de Dondis; fac-simile du manuscript de Padoue et traduction française par Emmanuel Poulle, Padua/Paris. For an English translation of Astrarium, see G.H. Baillie, H.A.Lloyd and F.A.B.Ward, 1974, The Planetarium of Giovanni de Dondi, London; however, this translation is less satisfactory as it is a composite of two manuscripts, with illustrations from a third.Further ReadingS.Bedini and F.Maddison, 1966, "Mechanical universe. The astrarium of Giovanni de"Dondi' Transactions of the American Philosophical Society 56:1–69 (for the history of the clock).H.A.Lloyd, 1958, Some Outstanding Clocks Over 700 Years, 1250–1950, London, pp. 9–24 (for its construction).DV
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Astrarium — An astrarium, also called a planetarium, is the mechanical representation of the cyclic nature of astronomical objects in one timepiece. It is an astronomical clock.HistoryGreek and Roman World, was recently redated between [150 to 100 B.C] [http … Wikipedia
Astrarium — Giovanni de’ Dondi, auch Giovanni Dondi dall Orologio (* 1318 in Chioggia, Venetien, Italien; † 22. Juni 1389 in Mailand, Lombardei) war ein italienischer Gelehrter und Hochschullehrer. Er entwickelte das „Astrarium“, eine der ersten öffentlichen … Deutsch Wikipedia
De Dondi — Jacopo and Giovanni de Dondi (father and son) were scholars active in 14th century Padua, Italy, and are remembered today as being pioneers in the art of clock design and construction. The Astrarium, designed and built by Giovanni de Dondi over a … Wikipedia
Giovanni Dondi — Statue de Giovanni Dondi à Prato della Valle Giovanni Dondi appelé en Italie Giovanni Dondi dell Orologio (né en 1318 à Chioggia et mort le 22 juin 1389 è Milan) est un médecin, astronome, philosophe, poète, horloger et universitaire… … Wikipédia en Français
Астрариум — Астрариум, реконструированный итальянским мастером Карло Кроче по описаниям Джованни де Донди[1] Астрариум, так … Википедия
Giovanni Di Dondi — Jacopo et son fils Giovanni de Dondi sont des universitaires italiens du XIVe siècle qui enseignent à l université de Padoue. Ils sont des pionniers de l horlogerie. Giovanni de Dondi met au point après 16 ans de recherche une horloge… … Wikipédia en Français
Giovanni di Dondi — Jacopo et son fils Giovanni de Dondi sont des universitaires italiens du XIVe siècle qui enseignent à l université de Padoue. Ils sont des pionniers de l horlogerie. Giovanni de Dondi met au point après 16 ans de recherche une horloge… … Wikipédia en Français
Giovanni di dondi — Jacopo et son fils Giovanni de Dondi sont des universitaires italiens du XIVe siècle qui enseignent à l université de Padoue. Ils sont des pionniers de l horlogerie. Giovanni de Dondi met au point après 16 ans de recherche une horloge… … Wikipédia en Français
Giovanni Dondi — Giovanni de’ Dondi, auch Giovanni Dondi dall Orologio (* 1318 in Chioggia, Venetien, Italien; † 22. Juni 1389 in Mailand, Lombardei) war ein italienischer Gelehrter und Hochschullehrer. Er entwickelte das „Astrarium“, eine der ersten öffentlichen … Deutsch Wikipedia
Giovanni de Dondi — Giovanni de’ Dondi, auch Giovanni Dondi dall Orologio (* 1318 in Chioggia, Venetien, Italien; † 22. Juni 1389 in Mailand, Lombardei) war ein italienischer Gelehrter und Hochschullehrer. Er entwickelte das „Astrarium“, eine der ersten öffentlichen … Deutsch Wikipedia
Solar time — On a prograde planet like the Earth, the sidereal day is shorter than the solar day. At time 1, the Sun and a certain distant … Wikipedia
