Man relies on a sextant to navigate which is accurate whether the Earth is round or flat like a rectangle. Am I correct? - Quora
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Amazon.com : Davis Sextant Mark 3 Artificial Horizon 144 Navigation Bundle (2 Items) : Sports & Outdoors
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Amazon.com: MAH 8'' Maritime Antiques Marine Captain Sextant Nautical Vintage Antique Style with Wooden Box.C-3083 : Home & Kitchen
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