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Pre-Modern High Tech

Last month the Washington Post ran a short article by Erin Blakemore on medieval scientific instruments, “Think smartphones are astonishing? Discover the ‘high tech’ devices of the Middle Ages and the Renaissance.” It was a little light on details, but nicely highlighted Epact, an on-line collection of pre-modern scientific instruments. It is easy while away […]

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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 […]

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HoS Advent Calendar 2016

Astrolabes on Iraqi Banknotes

In late 2003 the Coalition Provisional Authority governing Iraq introduced new banknotes and coins to replace the Hussein government’s currency. Celebrating the contributions Islamic scholars made to science, the new 250 dinar note was decorated with an engraving of an astrolabe on the obverse (and the Great Mosque of Samarra on the reverse). It wasn’t […]