Astrolabe Catalogue


Date ca. 1650
Maker Muḥammad Mahdī
Place Persia
Material Brass
Inventory no. 41763
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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