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  2. Galileo Galilei - Wikipedia

    en.wikipedia.org/wiki/Galileo_Galilei

    Galileo di Vincenzo Bonaiuti de' Galilei (15 February 1564 – 8 January 1642), commonly referred to as Galileo Galilei (/ ˌ ɡ æ l ɪ ˈ l eɪ oʊ ˌ ɡ æ l ɪ ˈ l eɪ /, US also / ˌ ɡ æ l ɪ ˈ l iː oʊ-/; Italian: [ɡaliˈlɛːo ɡaliˈlɛːi]) or mononymously as Galileo, was a Florentine astronomer, physicist and engineer, sometimes described as a polymath.

  3. Galilean moons - Wikipedia

    en.wikipedia.org/wiki/Galilean_moons

    Galileo Galilei, the discoverer of the four moons. As a result of improvements that Galileo Galilei made to the telescope, with a magnifying capability of 20×, [5] he was able to see celestial bodies more distinctly than was previously possible. This allowed Galileo to observe in either December 1609 or January 1610 what came to be known as ...

  4. History of astronomy - Wikipedia

    en.wikipedia.org/wiki/History_of_astronomy

    Galileo Galilei was among the first to use a telescope to observe the sky, and after constructing a 20x refractor telescope. [83] He discovered the four largest moons of Jupiter in 1610, which are now collectively known as the Galilean moons, in his honor. [84] This discovery was the first known observation of satellites orbiting another planet ...

  5. Timeline of Solar System astronomy - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_Solar_System...

    With a Galilean telescope, the observer could see magnified, upright images on the Earth—what is commonly known as a spyglass—but also it can be used to observe the sky, a key tool for further astronomical discoveries. Galileo showing the Doge of Venice how to use the telescope (fresco by Giuseppe Bertini) Ole Rømer at work; 1609 ...

  6. Sidereus Nuncius - Wikipedia

    en.wikipedia.org/wiki/Sidereus_Nuncius

    Galileo's drawings of Jupiter and its Medicean Stars from Sidereus Nuncius. Image courtesy of the History of Science Collections, University of Oklahoma Libraries. In the last part of Sidereus Nuncius, Galileo reported his discovery of four objects that appeared to form a straight line of stars near Jupiter. On the first night he detected a ...

  7. Celatone - Wikipedia

    en.wikipedia.org/wiki/Celatone

    The celatone was a device invented by Galileo Galilei to observe Jupiter's moons with the purpose of finding longitude on Earth. It took the form of a piece of headgear with a telescope taking the place of an eyehole.

  8. Discovery and exploration of the Solar System - Wikipedia

    en.wikipedia.org/wiki/Discovery_and_exploration...

    Italian polymath Galileo Galilei was an early user and made prolific discoveries, including the phases of Venus, which definitively disproved the arrangement of spheres in the Ptolemaic system. Galileo also discovered that the Moon was cratered, that the Sun was marked with sunspots, and that Jupiter had four satellites in orbit around it. [13]

  9. Timeline of fundamental physics discoveries - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_fundamental...

    1608 – Earliest known telescopes; 1609, 1619 – Kepler: Kepler's laws of planetary motion; 1610 – Galileo Galilei: discovered the Galilean moons of Jupiter; 1613 – Galileo Galilei: Inertia; 1621 – Willebrord Snellius: Snell's law; 1632 – Galileo Galilei: The Galilean principle (the laws of motion are the same in all inertial frames)