Astrolabe Catalogue


Front of astrolabe without rete or plates. Click to enlarge
Date 1719/20 (A.H. 1132)
Maker ‘Abd al-A’imma
Place Iṣfahān
Material Brass
Inventory no. 46681
Acquisition Presented by J. A. Billmeir in 1957


The throne is of the indo-persian, engraved type . The throne is attached with a integrated base. The front of the throne bears an inscription. The back is decorated with foliage. The throne is crowned with a spade-shaped tab to which the shackle attaches.


The ring is of the simple, squared cross-section type (i.e. a simple ring made from a round rod or piece of metal). Not uncommonly, the metal used to make this ring was not round but more of a rounded square shape.


Shackle of the omega type (i.e. Ω-shaped shackle). This shackle is rather ornate, both in the decoration on the ring and the carved tabs that attache to the throne..


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


The womb is engraved with a gazeteer. The city names are embossed against an ornate background. The remainder of the table includes longitude, latitude, inḥirāf, and the jihā..
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