Arabian Astrolabe (ca. 1000 AD)


Brass, diameter 120 mm, weight ca. 650 g
CHF 1300.00, EUR 1130.00

Arabian Astrolabe (ca. 1000 AD)

The instrument corresponds to the oldest existing astrolabes. The inscriptions are Arabic-Cufic, but with later additions in Latin-gothic. Many of such Arabian astrolabes with Latin “translations” are known. Four tabletts with 6-degree-almucantars (elevation-circles above the horizon) and the lines of the temporal hours are present in the reproduction, valid for the (Persian) latitudes 39°, 36°, 33°, 30°, 27°, 24°, 21° and 18°. Above the plates rotates the rete with the eccentric ecliptic circle (3°-dividing) and with 19 star-pointers. A rule is not present, as usual for early Arabic instruments. The edge shows four 90-degree-quadrants with inscriptions for every 5 degrees in Cufic. There is no hour-scale, but every 15 degree is marked to indicate the common equinoctial hours. The back of the astrolabe gives a degree-dividing in the upper half, to use together with the alhidade (double-rule) with diopter. Below are two shadow-scales or cotangent-scales. Further we find a zodiac-circle, coupled with astrological dividings with oldfashioned planetary symbols.
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