Astrolabe Catalogue

 

Small image of astrolabe back with rules or alidades removed. Click to enlarge.
Date late 16th or early 17th century
Place Persia (?)
Material Brass
Inventory no. 47063
Acquisition Lent by the Bodleian Library, Oxford, in 1952

Back



The back contains 8 scales of the following types:
Type
(click to view scale details)
Range & Units Numbered Geometry Location
Degree 0 - 90, Degrees of arc Every 6 degrees Circular, concentric Upper right quadrant of outer circular on back of instrument.
Degree 0 - 90, Degrees of arc Every 6 degrees Circular, concentric Upper left quadrant of outer circular on back of instrument.
Degree 0 - 90, Degrees of arc Every 6 degrees Circular, concentric Lower left quadrant of outer circular on back of instrument.
Degree 0 - 90, Degrees of arc Every 6 degrees Circular, concentric Lower right quadrant of outer circular on back of instrument.
Sine/Cosine 1/60 of quadrant radius Not numbered  Angle Upper left quadrant (inside circular scales)
Sine/Cosine 1/60 of quadrant radius Not numbered  Angle Lower left quadrant
Declination None Not numbered  Arc Upper right quadrant (inside circular scales)
Shadow square 0 - 12, Fingers Every 1 fingers Box Right hand bottom face of the shadow square (in LR)
Shadow square 0 - 12, Fingers Every 1 fingers Box Right hand vertical face of the shadow square (in LR)
Shadow square 0 - 7, Feet Every 1 feet Box Right hand bottom face of the shadow square (in LR)
Shadow square 0 - 7, Feet Every 1 feet Box Right hand vertical face of the shadow square (in LR)
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