ScienceAlert - This nifty 16th century ring is unfolded into an astronomical sphere. Armillary spheres like this one model objects in the sky with lines of celestial longitude and latitude first known
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AndTartary and antiquity on Twitter: "THE RING IS AN ASTRONOMICAL SPHERE. Astronomers in the 16th and 19th centuries wore rings that unfolded to become tools for calculations. The rings looked like ordinary
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