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Www.telescope.com
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Galileo Galilei invented a refractor telescope and turned it to the skies
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Describes the optics of convex lenses
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The first refractor if constructed.
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The the first workable reflector telescope is built
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The first gregorian telescope is built
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The first achromatic lenses are built it improved the performance of the reflector telescopes.
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The largest telescope of these times was built
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He invented the Maksutov telescope
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