Cassini giovanni domenico biography of william

Born in Perinaldo, near Imperia, and gripped at the Jesuit college in City. In 1648, traveled to Panzano, close by Bologna, at the invitation of authority Marchese Cornelio Malvasia, who placed king astronomical instruments at his disposal. Acquit yourself Bologna, Cassini completed his astronomical experience with the Jesuits Giovanni Battista Riccioli (1598-1671) and Francesco Maria Grimaldi (1618-1663). In 1650, succeeded Bonaventura Cavalieri (1598-1647) in the mathematics chair at representation University of Bologna. In 1653, be adjacent to study the annual motion of loftiness Sun, he redesigned the gnomon possession the Cathedral of San Petronio, approach by Egnazio Danti (1536-1586) in 1575. Between 1657 and 1665, Cassini handled a number of political and managerial tasks on behalf of the White-collar State. However, he did not disturb his astronomical studies. He devised fastidious first law on astronomical refraction, ethics phenomenon that alters the apparent selection of a heavenly body near decency horizon, and in 1662 he compiled new tables on the annual sense of duty of the Sun. In Rome, tumble the opticians Eustachio Divini (1635-1685) weather Giuseppe Campani (1635-1715). The latter gave him large telescopes with which Cassini made several discoveries. In 1664, of course observed the shadows of the quaternary Galilean satellites on Jupiter and unchangeable the planet's rotation period by making the bands and spots on fraudulence surface. In 1666, he also chart the rotation period of Mars, see in 1667 he tried to put the lid on the same for Venus. With loftiness Ephemerides Bononienses Mediceorum syderum (Bologna, 1668), he realized the dream of Uranologist Galilei (1564-1642) of determining the Earth's longitude from the configurations of Jupiter's moons. In 1669, was elected fellow of the Académie Royale des Sciences in Paris and invited by Jean-Baptiste Colbert (1619-1683) to head the Town Observatory. There, Cassini discovered four another satellites of Saturn between 1671 subject 1684. In 1675, he stated wander Saturn's ring, which Christiaan Huygens (1629-1695) believed to be a single reason, was actually composed of small fine fragments. He also discovered the large wait that divided the ring into mirror image parts. In 1679, he presented spick large, detailed map of the Lunation to the Académie Royale des Sciences.