Astrolabe Catalogue

 

Date ca. 1650
Maker Muḥammad Mahdī
Place Persia
Material Gilt brass
Inventory no. 50143
Acquisition Presented by Lewis Evans in 1924

Rule, Regula, Pointer and Alidade Images

Alidade Image:

astrolabe part (photo)

Alidade

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

Scales


Type Range & Units Numbered Geometry Location
Sine/Cosine 1 - 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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