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astrolabe SUBST

astrolabe ASTRON

astrolabe ASTRON

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He made improvements to the astrolabe by introducing brass instruments in place of cumbrous wooden ones. en.wikipedia.org

A combination of the planisphere and dioptra, the astrolabe was effectively an analog computer capable of working out several different kinds of problems in spherical astronomy. en.wikipedia.org

His left hand holds an astrolabe, and his right index finger points to the heavens. en.wikipedia.org

He also wrote on mechanical devices like the astrolabe and sundial. en.wikipedia.org

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