JIM WEST / SCIENCE PHOTO LIBRARY JIM WEST / SCIENCE PHOTO LIBRARY
Keck Center. View of an armillary sphere outside the Keck Center of the US Academy of Sciences, Engineering, and Medicine, Washington DC, USA. An armillary sphere, or circular astrolabe, has moveable interlocking rings representing the circles of the celestial sphere, which are used to demonstrate the motion of the stars around the Earth.
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