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Galilean telescope, instrument for viewing distant objects, named after the great Italian scientist Galileo Galilei (1564–1642), who first constructed one in 1609. With it, he discovered Jupiter’s four largest satellites, spots on the Sun, phases of Venus, and hills and valleys on the Moon.
Galileo Galilei (1564-1642) was part of a small group of astronomers who turned telescopes towards the heavens. After hearing about the "Danish perspective glass" in 1609, Galileo constructed his own telescope.
Jul 13, 2016 · Learn how Galileo Galilei invented and improved the refractor telescope in 1610, and how he used it to observe the Moon, Jupiter, Saturn, the Sun and Venus. Find out what happened to his telescope after his death and how it is preserved today.
Mar 13, 2018 · Learn how Galileo invented and used the first telescope to make groundbreaking astronomical discoveries. Find out how a Galilean telescope works and what Galileo observed with it.
Jun 10, 2024 · In the fall of 1609 Galileo began observing the heavens with instruments that magnified up to 20 times. In December he drew the Moon ’s phases as seen through the telescope, showing that the Moon’s surface is not smooth, as had been thought, but is rough and uneven.
Aug 18, 2023 · Galileo's telescope influenced the Scientific Revolution enormously because the geocentric theory that the Earth was the centre of the universe was disproved and a whole new range of natural phenomena could be now observed instead of only theorized about.
Galileo Galilei did not invent the telescope but was the first to use it systematically to observe celestial objects and record his discoveries. His book, Sidereus nuncius or The Starry Messenger was first published in 1610 and made him famous.
