Thinking Spatially

Cross-staffs, astrolabes, and other devices: Determining Positions on the Planet


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Cross-staffs, astrolabes, and other devices: Determining Positions on the Planet, and paving the way for GPS.  Think spatially as we consider these devices, how they were used, and the impact they had.
Cross staffs and sextants
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Thinking SpatiallyBy Joseph Kerski

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