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Astrolabe |
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| The astrolabe is an ancient instrument that measures the positions of heavenly bodies. Greek astronomer Hipparchus may have used an astrolabe in the 1st century bc. It was also popularly used by navigators until the sextant was invented in the 18th century. | ||||||
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| Paul Almasy/Corbis | ||||||
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| Appears in these articles: | ||||||
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| Navigation; Astrolabe | ||||||
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