22 Facts About Giovanni Cassini

Giovanni Domenico Cassini, known as Jean-Dominique Cassini was an Italian mathematician, astronomer and engineer.

Giovanni Cassini is known for his work on astronomy and engineering.

Giovanni Cassini discovered four satellites of the planet Saturn and noted the division of the rings of Saturn; the Cassini Division was named after him.

Giovanni Domenico Cassini was the first of his family to begin work on the project of creating a topographic map of France.

Giovanni Cassini was the son of Jacopo Giovanni Cassini, a Tuscan, and Giulia Crovesi.

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In 1648 Giovanni Cassini accepted a position at the observatory at Panzano, near Bologna, to work with Marquis Cornelio Malvasia, a rich amateur astronomer, initiating the first part of his career.

Giovanni Cassini was employed by the senate of Bologna as hydraulic engineer, and appointed by Pope Alexander VII inspector of fortifications in 1657.

In San Petronio, Bologna, Giovanni Cassini convinced church officials to create an improved sundial meridian line at the San Petronio Basilica, moving the pinhole gnomon that projected the Sun's image up into the church's vaults 66.

Giovanni Cassini 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.

Giovanni Cassini remained in Bologna working until Colbert recruited him to come to Paris to help set up the Paris Observatory.

The country turned out to be considerably smaller than expected, and the king quipped that Giovanni Cassini had taken more of his kingdom from him than he had won in all his wars.

Giovanni Cassini observed and published surface markings on Mars, 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.

Giovanni Cassini was the first to observe these four moons, which he called Sidera Lodoicea, including Iapetus, whose anomalous variations in brightness he correctly ascribed as being due to the presence of dark material on one hemisphere.

Around 1690, Giovanni Cassini was the first to observe differential rotation within Jupiter's atmosphere.

Giovanni Cassini initially held the Earth to be the centre of the Solar System, though later observations compelled him to accept the model of the Solar System proposed by Nicolaus Copernicus, and eventually that of Tycho Brahe.

Giovanni Cassini was the first to make successful measurements of longitude by the method suggested by Galileo, using eclipses of the Galilean satellites as a clock.

In 1683, Giovanni Cassini presented the correct explanation of the phenomenon of zodiacal light.

Giovanni Cassini was intrigued enough by it to spend considerable time and effort deciphering its cryptic contents, determining on the way that the document originated in India.

In 1653, Giovanni Cassini, wishing to employ the use of a meridian line, sketched a plan for a new and larger meridian line but one that would be difficult to build.

Giovanni Cassini's calculations were precise; the construction succeeded perfectly; and its success gave Cassini a brilliant reputation for working with engineering and structural works.

Giovanni Cassini was employed by Pope Clement IX in regard to fortifications, river management, and flooding of the Po River.

The Pope asked Giovanni Cassini to take Holy Orders to work with him permanently but Giovanni Cassini turned him down because he wanted to work on astronomy full-time.