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Persian Astrolabes on Auction

Bloomberg of all places reported last month on two Persian astrolabes coming up for auction at Sotheby’s. Why I don’t really know. The article itself is brief, really just a paragraph or two, and seems to be a string of staccato like factoids: before sextants there were astrolabes; Columbus might have taken one with him […]

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HoS Advent Calendar 2016

A Spherical Astrolabe

The most common type of astrolabe is the planispheric astrolabe, which works by projecting the sphere of the heavens onto a plane in a way that preserves angular distances and allows the user to carry out a wide variety of calculations.[1] The rarest form type of astrolabe is the spherical astrolabe. Although Latin and Arabic […]