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In 1605, Galileo had been employed as a mathematics tutor for Cosimo de' Medici. In 1609, Cosimo became Grand Duke Cosimo II of Tuscany. Galileo, seeking patronage from his now-wealthy former student and his powerful family, used the discovery of Jupiter's moons to gain it. [6] On 13 February 1610, Galileo wrote to the Grand Duke's secretary:
The focus of this extended mission was to follow up on the discoveries made at Europa with seven additional flybys to search for new evidence of a possible sub-surface water ocean. [21] Starting in May 1999, Galileo used four flybys (20 to 23) with Callisto to lower its periapse, setting up a chance for it to fly by Io twice in late 1999. [2]
Ptolemy's map of the Mediterranean superimposed on a modern map, with Greenwich as the reference longitude. Ptolemy, in the 2nd century AD, based his mapping system on estimated distances and directions reported by travellers. Until then, all maps had used a rectangular grid with latitude and longitude as straight lines intersecting at right ...
He encountered the powerful Gulf Stream, and found a passage through the Florida Keys to land on the southwestern coast of Florida on the Gulf of Mexico. Again, the exact location is disputed. [ 3 ] While it is true that Columbus visited Puerto Rico and the Virgin Islands in 1493, Ponce de Leon was the first known European to reach the present ...
Stokes, Discoveries in Australia, With an Account of the Coasts and Rivers Explored and Surveyed During The Voyage of H.M.S. Beagle, in the Years 1837-38-39-40-41-42-43. By Command of the Lords Commissioners of the Admiralty. Also a Narrative of Captain Owen Stanley's Visits to the Islands in the Arafura Sea. Vol. 1 and Vol. 2 (London, 1846)
Map of the island city Tenochtitlán and Mexico gulf made by one of Hernán Cortés' men, 1524, Newberry Library, Chicago Discovery of the Mississippi by William H. Powell (1823–1879) is a Romantic depiction of de Soto seeing the Mississippi River for the first time.
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Galileo observed the Loki volcano (largest in the Solar System) and a new eruption in the southern region of the moon. I33 102 (63) 17 January 2002 This was the closest of all the flybys of Io. The moon provided a gravity-assist necessary for Galileo ' s ultimate collision course with Jupiter.