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Hadley's Sextant

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Hadley's Sextant.jpg HipparchusThumbnailsGalileo and the Well-sinkersHipparchusThumbnailsGalileo and the Well-sinkersHipparchusThumbnailsGalileo and the Well-sinkersHipparchusThumbnailsGalileo and the Well-sinkersHipparchusThumbnailsGalileo and the Well-sinkers