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Cassini observed and published surface markings on Mars (earlier seen by Christiaan Huygens but not published), determined the rotation periods of Mars and Jupiter, and discovered four satellites of Saturn: Iapetus and Rhea in 1671 and 1672, and Tethys and Dione (1684). Retrieved October 16, 2020 from Encyclopedia.com: https://www.encyclopedia.com/science/news-wires-white-papers-and-books/cassini-giovanni-domenico. He thoroughly adopted his new country, to the extent that he became interchangeably known as Jean-Dominique Cassini – although that is also the name of his great-grandson, Dominique, comte de Cassini. In the 1670s, Cassini began work on a project to create a topographic map of France, using Gemma Frisius's technique of triangulation. L'astéroïde (24101) Cassini, le cratère martien Cassini, le cratère lunaire Cassini et la sonde Cassini-Huygens ont été nommés en son honneur. His calculations were precise; the construction succeeded perfectly; and its success gave Cassini a brilliant reputation for working with engineering and structural works.[6]. His principal observations, published in Specimen observationum Bononiensium… (1656), are dedicated to Queen Christina of Sweden, then in exile in Italy. Cassini also studied atmospheric refraction and conducted a geodetic survey . Later in life he focused almost exclusively on astronomy and all but denounced astrology as he became increasingly involved in the Scientific Revolution. Cassini continued the observational work begun in Italy using a lens made by Campani with a focal length of seventeen feet that he had brought from Italy, as well as others even more powerful (up to a focal length of 136 feet), commissioned from either Campani or Divini, or from French lensmakers. He found another satellite of Saturn, Rhea, in 1672. He was appointed professor of astronomy at the University of Bologna in 1650 and became, in 1671, director of the Paris Observatory. Desiring to enhance the prestige of the Academy, Colbert endeavored to attract to France several famous for eign scientists. In 1683, Cassini presented the correct explanation of the phenomenon of zodiacal light. Between 1671 and 1679 Cassini made observations of the Moon, compiling a large map, which he presented to the Académie. Toronto: Royal Astronomical Society of Canada, 1999. Cassini was an astronomer at the Panzano Observatory from 1648 to 1669. Le 12 juin 1655, il est chargé de reconstruire la méridienne dans la Basilique San Petronio de Bologne ; elle est terminée en décembre 1657. Cassini accepted, and in 1668 Colbert proposed that he come to Paris for a limited period, under attractive financial conditions, to help set up the observatory, the construction of which had just begun. 1821),686–804, and table, I, LXVII–LXIX: A. Fabroni, in Vitae Italorum docirina excellentium, IV (Pisa, 1779), 197–325, B. Fontenelle, “Éloge de J. D. Cassini,” in Histoire del’Académie rovale des Sciences [pour] 1712 (Paris, 1714), and ibid., 84–106; F. Hoefer, in Nouvelle biographic générale, IX (Paris, 1835), cols. World Encyclopedia. Cassini was the son of Jacopo Cassini, a Tuscan, and Giulia Crovesi. She led the imaging science team on the Cassini mission in orbit around Saturn. "Cassini, Gian Domenico (Jean-Dominique) (Cassini I) In 1674 he married Geneviève de Laistre, the daughter of the lieutenant general of the comté of Clermont. B. Biot, in Biographie universelle, VII (Paris. "From this marriage Cassini had two sons; the younger, Jacques Cassini, succeeded him as astronomer and geodesist under the name of Cassini II. For the remaining forty-one years of his life Cassini served as astronomer/astrologer to Louis XIV ("The Sun King"); serving the expected dual role yet focusing the overwhelming majority of his time on astronomy rather than the astrology he had studied so much in his youth. "[6] In 1663 he was named superintendent of fortifications and in 1665 inspector for Perugia. Let us know if you have suggestions to improve this article (requires login). He concluded the changes in size he measured were consistent with Johannes Kepler's 1609 heliocentric theory, where the Earth was moving around the Sun in an elliptical orbit instead of the Ptolemaic system where the Sun orbited the Earth in an eccentric orbit. "[6] In 1663 he was named superintendent of fortifications and in 1665 inspector for Perugia. In addition he discovered the Cassini Division in the rings of Saturn (1675). Cassini was employed by Pope Clement IX in regard to fortifications, river management, and flooding of the Po River. World Encyclopedia.

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