Astrolabe Catalogue

The back contains 15 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	Zodiacal divisions, equal or unequal	Not numbered	Arc	Upper right quadrant (inside circular scales)
Azimuth of Qibla	Cities	Not numbered	Arc	Upper right quadrant (inside circular scales)
Altitude of noon sun	28 - 40, Degrees of latitude	Every 2 degrees	Arc	Upper right quadrant (inside circular scales)
Sine/Cosine	0 - 60, 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 - 45, 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, Zodiacal divisions, equal or unequal	Not numbered	Inner Circular, concentric	half circle inside the VI circle (on mashriqi astrolabes) - covering LL and LR
Shadow square	0 - 7, Feet	Every 2 and at 7 feet	Box	Left hand vertical 'face' of the shadow square (in LL)
Shadow square	0 - 7, Feet	Every 2 and at 7 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)
Triplicities	None		Inner Box	Box 'inside' the shadow square. Common site for triplicities, etc.

The back is inscribed:

Transcription	Translation	Notes	Type
صنعه عبد الائمه	‘Abd al-A’imma made this		Maker's signature