Star-Finders Astrolabes - 1001 Inventions

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(Right) This type of instrument was previously not known to exist.  … this instrument is important for the history of instrumentation for another reason: it partly resolves the question of the origin of the solar/calendrical scales on Islamic instruments. Julio Samsó has favoured an Andalusī origin. Direct evidence from Late Antiquity of scales of this kind from either end of the Mediterranean is not available. … However, now we have an earlier example of them from Baghdad that is certainly without any Andalusī influence whatsoever. ” David A. King, An Instrument of Mass Calculation made by Nastūlus in Baghdad ca. 900

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