Hans Lippershey

The Discovery of the Four Galilean Moons

The Discovery of the Four Galilean Moons

On January 7, 1610, physicist and astronomer Galileo Galilei turned his new telescope to the nocturnal sky to watch the planet Jupiter and discovered the eponymous four moons of Jupiter, Io, Europa, Ganimede, and Callisto.[1,2] The Telescope Based only on uncertain descriptions of the first practical telescope which the Dutch lens maker Hans Lippershey [3] tried to patent in the Netherlands in 1608, Galileo Galilei, in the following year was able to improve…
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Hans Lippershey and the Telescope

Hans Lippershey and the Telescope

Hans Lippershey(1570 – 1619) On October 2, 1608,  German-Dutch lensmaker Hans Lippershey applied to the States-General of the Netherlands for a patent for his instrument “for seeing things far away as if they were nearby”. Even though scientists of the 12th century never heard of telescopes and most of them did not know specific laws of optics, the started laying the foundations for telescopes as we know them today. Ptolemy already began…
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Galileo Galilei and his Telescope

Galileo Galilei and his Telescope

Galileo Galilei showing the Doge of Venice how to use the telescope,Fresco at Villa Andrea Ponti, Varese, 1858 On August 25, 1609, Galileo Galilei publicly demonstrated his newly built telescope for the first time to Venetian lawmakers. Besides its astronomical value Galileo’s telescope was also a profitable sideline for him selling telescopes to merchants who found them useful both at sea and as items of trade. Galileo published his initial telescopic astronomical…
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