Gemma (given name)
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Gemma Frisius
List of craters on the Moon: G–K
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Meanings of minor-planet names: 11001–12000
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Gemma Frisius (crater)
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John Scolvus
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Goniometer
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List of Renaissance figures
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Pole star
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List of amateur mathematicians
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Dokkum
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Petrus Apianus
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Al-Zarqali
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Theodolite
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List of geographers
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Triangulation
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Abraham Ortelius
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Leuven
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Gerardus Mercator
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Robert Hooke
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Camera obscura
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1544
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1508
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1547
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1555
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Polaris
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May 25
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John Harrison
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December 9
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List of cartographers
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Reinier Jemma
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Regnier Gemma Frisius
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