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Galileo set himself to improving the telescope, producing telescopes of increased magnification. His first telescope had a 3x magnification, but he soon made instruments which magnified 8x, and finally, one nearly a meter long with a 37mm objective (which he would stop down to 16mm or 12mm) and a 23x magnification. [40]
1609 — Galileo Galilei makes his own improved version of Lippershey's telescope, calling it a "perspicillum". 1611 — Greek mathematician Giovanni Demisiani coins the word " telescope " (from the Greek τῆλε , tele "far" and σκοπεῖν , skopein "to look or see"; τηλεσκόπος, teleskopos "far-seeing") for one of Galileo ...
Galileo began his telescopic observations in the later part of 1609, and by March 1610 was able to publish a small book, The Starry Messenger (Sidereus Nuncius), describing some of his discoveries: mountains on the Moon, lesser moons in orbit around Jupiter, and the resolution of what had been thought to be very cloudy masses in the sky (nebulae) into collections of stars too faint to see ...
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.
Galileo Galilei was an Italian scientist who is sometimes referred to as the "father of modern observational astronomy". [16] His improvements to the telescope, astronomical observations, and support for Copernicanism were all integral to the Copernican Revolution.
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 ...
The Keplerian telescope, invented by Johannes Kepler in 1611, is an improvement on Galileo's design. [12] It uses a convex lens as the eyepiece instead of Galileo's concave one. The advantage of this arrangement is that the rays of light emerging from the eyepiece [dubious – discuss] are converging.
One of Galileo's first telescopes had 8x to 10x linear magnification and was made out of lenses that he had ground himself. [8] This was increased to 20x linear magnification in the improved telescope he used to make the observations in Sidereus Nuncius .