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Tubeless telescope described by Huygens, 17th century - Stock Image - C048/5297 - Science Photo Library
Illustration de Astrocopia compendiaria] / [Non identifié] ; Christian Huygens, aut. de texte | Gallica
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Telescope for Earth 650 mm Tube 50 mm Lens Diameter 91 cm Floor Tripod 6 Finder Mount Huygens Eyepiece: Amazon.de: Electronics & Photo
What was the aperture of Galileo's telescope that he used to see the rings of Saturn, Jupiter's moons, and the phases of Venus? - Quora
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