Astrolabe Catalogue

 

Complete front of astrolabe including rete. Click to enlarge.
Date 1327/28 (A.H. 724)
Maker ‘Alī ibn Ibrāhīm al-Jazzār
Place Taza
Material Brass
Inventory no. 50853
Acquisition Purchased from Ernst Weil in 1957

Throne

The throne is of the simple type . The throne is attached with a integrated base. The throne is pierced by two small holes on each side of the shackle. The front is integrated with the limb; the back with the back plate.

Ring

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

Shackle of the omega type (i.e. Ω-shaped shackle). .

Mater

The mater and limb are of two pieces, riveted construction. . Scales on the limb:
Type Range & Units Numbered Geometry Location
Degree 0 - 360 Degrees of arc Every 5 degrees Circular, concentric outer

Womb


Contains a universal projection with an set of almucantars for 90°.


Universal

Universal with Azarquiel/Saphea/Gemma Frisius projection. Onto the base Azarquiel projection has been imposed a set of almucantars, spaced 5° apart and engraved as if for a 90° projection. The universal contains the following:
Angle of inclination Direction of inclination Labelled Language Script Line style Notes
None N/A None None
The universal contains the following meridians:
Interval Style of line Number style Description
Plain Arabic Abdjad, maghrib Numbered along the central parallel
The universal contains the following parallels:
Range Interval Style of line Number style Description
  Plain Arabic Abdjad, maghrib Numbered from the poles to the central parallel
More information

Stars

The universal contains the following stars. Click on the star name or modern star name to search for other astrolabes with the same star.
Star name
(on instrument)
Modern star
(if known)
Mediation Declination Pointer
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