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    Re: Hyatt's Celestial Coordinator
    From: Frank Reed
    Date: 2020 Apr 26, 13:54 -0700

    There's also this one for sale (listed today, so probably the auction that Dave Walden referenced):
    https://www.ebay.com/itm/Hyatts-Celestial-Coordinator-Stereographic-Orthographic-Projection/193438249011

    Anyone need more photos? There's this neat thing called "Google" that may help: Google Image search for Hyatt Celestial Coordinator.

    The device is a simple analog "computer" from the 1940s for solving spherical trig problems with a resolution (accuracy) of about half a degree. Here's an article on the device and related tools from marinersmuseum.org: Magnetic Compass Meets Sundial (pdf).

    Frank Reed

       
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