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Early works to 1800 Astronomical instruments 1 Astronomy 1 Faculae 1 Observations 1 Refraction, Astronomical 1 Sunspots 1 more ...
Early works to 1800 Astronomical instruments 1 Astronomy 1 Faculae 1 Observations 1 Refraction, Astronomical 1 Sunspots 1 more ...
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