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25 Aug 1609. Galilei Galileo demonstrates his first telescope

By WcP.Scientific.Mind - Posted on 25 August 2008

(quote)

Called the Father of Modern Science by Einstein, Galileo was born into a musical family in Pisa. After studying mathematics and natural philosophy he was appointed to the Chair of Mathematics in 1589 before moving to the University of Padua where he made major discoveries in Fundamental and Applied Science. These included a military compass and an improved version of the telescope. With the later he was the first to identify the moons of Jupiter and describe the topography of our Moon.

On 25 August 1609, he demonstrated one of his early telescopes, with a magnification of about 8 or 9, to Venetian lawmakers. With a Galilean telescope, the observer could see magnified, upright images on the earth - it was what is commonly known as a terrestrial telescope or a spyglass. He could also use it to observe the sky; for a time he was one of those who could construct telescopes good enough for that purpose.

(unquote)

Image credit Giuseppi Bertini (Public Domain)

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