Astrolabe Catalogue


Date 1708/9
Maker Khalīl Muḥammad ibn Ḥasan ‘Alī
Place Iṣfahān
Material Brass
Inventory no. 46680
Acquisition Presented by J. A. Billmeir in 1957

Rule, Regula, Pointer and Alidade Images

Alidade Image:

astrolabe part (photo)


Appearance Tip Sights Pinholes Notches Description
Double-ended,  original.  Simple Rigid Double None


Type Range & Units Numbered Geometry Location
Sine/Cosine 0 - 60 1/60 of quadrant radius Every 5  Linear Rule, right arm
Unequal hours 1 - 12 1/12 of daylight Every 1 hours Linear Rule, right arm
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