Astrolabe Catalogue


Front of astrolabe without rete or plates. Click to enlarge
Date late 9th century
Maker Khafīf, apprentice of ‘Alī ibn ‘Īsā
Place Syria
Material Brass
Inventory no. 47632
Acquisition Presented by J. A. Billmeir in 1957


The throne is of the pierced type . The throne is attached with a integrated base. A simple five-lobed throne. The front and the back bear short inscriptions about the maker and an early owner.. Markings:
Content Translation Notes Type
؟؟ احمد الفلكى الصنجارى [For] Aḥmad the astronomer from Ṣinjār Owner's mark
؟؟؟ على بن عيسى [Made by Khafīf the apprentice of] 'Alī ibn 'Īsā Maker's signature


The ring is of the simple, squared cross-section type (i.e. a simple ring made from a round rod or piece of metal).


Shackle of the omega type (i.e. Ω-shaped shackle). The tabs that attach the shackle to the throne are notably large..


The mater and limb are of one-piece construction. The tab used to hold tympans in place is located at the bottom of the instrument, 180° from the throne.. Scales on the limb:
Type Range & Units Numbered Geometry Location
Degree 0 - 360 Degrees of arc Every 5 degrees Circular, concentric None


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