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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 an Italian [a] astronomer, physicist and engineer, sometimes described as a polymath.
The Galileo National Telescope, (Italian: Telescopio Nazionale Galileo; TNG; code: Z19) is a 3.58-meter Italian telescope, located at the Roque de los Muchachos Observatory on the island of La Palma in the Canary Islands, Spain.
The design Galileo Galilei used c. 1609 is commonly called a Galilean telescope. [5] It used a convergent (plano-convex) objective lens and a divergent (plano-concave) eyepiece lens (Galileo, 1610). [6] A Galilean telescope, because the design has no intermediary focus, results in a non-inverted (i.e., upright) image. [7]
The first astronomer to publicly support Galileo's findings was Johannes Kepler, who published an open letter in April 1610, enthusiastically endorsing Galileo's credibility. It was not until August 1610 that Kepler was able to publish his independent confirmation of Galileo's findings, due to the scarcity of sufficiently powerful telescopes. [17]
Galileo's instrument was the first to be given the name "telescope". The name was invented by the Greek poet/theologian Giovanni Demisiani at a banquet held on April 14, 1611, by Prince Federico Cesi to make Galileo Galilei a member of the Accademia dei Lincei. [42]
Background: The focus tube and main telescope tube containing the achromatic doublet objective lens. The Galileoscope uses a 32 mm ( 1 + 1 ⁄ 4 in) focuser, giving the telescope a great deal of versatility, since this is the standard size for eyepieces used in most amateur and some professional telescopes.
The permanent exhibition includes all of Galileo's unique artifacts, among which are his only two extant telescopes and the framed objective lens from the telescope with which he discovered the Galilean moons of Jupiter; thermometers used by members of the Accademia del Cimento; and an extraordinary collection of terrestrial and celestial ...
In public, Galileo insisted that Guiducci, and not he, was the author of the Discourse on Comets. [13] Despite Galileo's public protestations, there is no doubt whatever that he was the main author of the Discourse on Comets. The manuscript is largely in Galileo's handwriting, and the sections in Guiducci's hand have been revised and corrected ...