Astrolabe Catalogue

The back contains 11 scales of the following types:

Type (click to view scale details)	Range & Units	Numbered	Geometry	Location
Altitude	0 - 90, Degrees of arc	Every 6 degrees	Circular, concentric	Upper right quadrant of outer circular on back of instrument.
Altitude	0 - 90, Degrees of arc	Every 6 degrees	Circular, concentric	Upper left quadrant of outer circular on back of instrument.
Declination	Gemini/Cancer - Sagittarius, Zodiacal divisions, equal or unequal	Not numbered	Arc	Upper right quadrant (inside circular scales)
Sine/Cosine	0 - 60, 1/60 of quadrant radius	Every 6	Angle	Upper left quadrant (inside circular scales)
Cotangent	0 - 54, Fingers	Every 6 fingers	Circular, concentric	Lower left quadrant of outer circular on back of instrument.
Cotangent	0 - 48, Feet	Every 6 feet	Circular, concentric	Lower right quadrant of outer circular on back of instrument.
Shadow square	0 - 12, Fingers	Every 1 fingers	Box	Left hand vertical 'face' of the shadow square (in LL)
Shadow square	0 - 12, Fingers	Every 1 fingers	Box	Left hand bottom face of the shadow square (in LL)
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)
Zodiacal signs	Zodiacal sign	Not numbered	Inner Circular, concentric	half circle inside the outer 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 V circle (on mashriqi astrolabes) - covering LL and LR

The back is inscribed:

Transcription	Translation	Notes	Type
عمل اقم العباد ضيا و الدين ابن قايم محمد اسطرلابى ١٠٦٤ سنه	The work of the least of the servants, the astrolabist Ḍiya ad-Dīn ’ibn Muḥammad, year 1064		Maker's signature