Astrolabe Catalogue

The back contains 13 scales of the following types:

Type (click to view scale details)	Range & Units	Numbered	Geometry	Location
Altitude	0 - 90, Degrees of arc	Every 5 degrees	Circular, concentric	Upper right quadrant of outer circular on back of instrument.
Altitude	0 - 90, Degrees of arc	Every 5 degrees	Circular, concentric	Upper left quadrant of outer circular on back of instrument.
Declination	Gemini/Cancer - Sagittarius/Capricorn, Zodiacal divisions, equal or unequal	Not numbered	Arc	Upper right quadrant (inside circular scales)
Sine/Cosine	1/60 of quadrant radius	Not numbered	Angle	Upper left quadrant (inside circular scales)
Cotangent	0 - 30, Feet	Every 5 feet	Circular, concentric	Lower left quadrant of outer circular on back of instrument.
Cotangent	0 - 40, Fingers	Every 5 fingers	Circular, concentric	Lower right quadrant of outer circular on back of instrument.
Terms	0° Aries - 30° Pisces, Zodiacal divisions, equal or unequal	At each term	Inner Circular, concentric	half circle inside the outer circle (on mashriqi astrolabes) - covering LL and LR
Zodiacal signs	Aries - Pisces, Zodiacal sign	Not numbered	Inner Circular, concentric	half circle inside the V circle (on mashriqi astrolabes) - covering LL and LR
Faces	0° Aries - 30° Pisces, Astrological face	Not numbered	Inner Circular, concentric	half circle inside the VI circle (on mashriqi astrolabes) - covering LL and LR
Lunar Mansions	0° Aries - 30° Pisces, Lunar mansion	Not numbered	Inner Circular, concentric	half circle inside the VII circle (on mashriqi astrolabes) - covering LL and LR
Shadow square	0 - 7, Feet	Every 2 feet	Box	Left hand vertical 'face' of the shadow square (in LL)
Shadow square	0 - 7, Feet	Every 2 feet	Box	Left hand bottom face of the shadow square (in LL)
Shadow square	0 - 12, Fingers	Every 2 fingers	Box	Right hand bottom face of the shadow square (in LR)
Shadow square	0 - 12, Fingers	Every 2 fingers	Box	Right hand vertical face of the shadow square (in LR)

The back is inscribed:

Transcription	Translation	Notes	Type
صنعه عبد الائمة	Made by ʿAbd al-Aʾimmah.	Inscription in cartouche within shadow square	Maker's signature