Astrolabe Catalogue

The back contains 10 scales of the following types:

Type (click to view scale details)	Range & Units	Numbered	Geometry	Location
Altitude	0 - 90, Degrees	Every 5 degrees	Circular, concentric	Upper right quadrant of outer circular on back of instrument.
Altitude	0 - 90, Degrees	Every 5 degrees	Circular, concentric	Upper left quadrant of outer circular on back of instrument.
Declination	Gemini/Cancer - Sagittarius/Capricorn, Zodiacal sign	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 - 36, Feet	Every 6 feet	Circular, concentric	Lower left quadrant of outer circular on back of instrument.
Cotangent	0 - 42, Fingers	Every 6 fingers	Circular, concentric	Lower right quadrant of outer circular on back of instrument.
Shadow square	0 - 7, Feet	Every 1 feet	Box	Left hand vertical 'face' of the shadow square (in LL)
Shadow square	0 - 7, Feet	Every 1 feet	Box	Left hand bottom face of the shadow square (in LL)
Shadow square	0 - 12, Fingers	Every 3 fingers	Box	Right hand bottom face of the shadow square (in LR)
Shadow square	0 - 12, Fingers	Every 3 fingers	Box	Right hand vertical face of the shadow square (in LR)
Terms	Zodiacal divisions, equal or unequal	Not numbered	Inner Box	Box 'inside' the shadow square. Common site for triplicities, etc.

The back is inscribed:

Transcription	Translation	Notes	Type
حسب الفرموده شاه مولانا فضيلت عبد الرزاق گيلانى تمام (؟) في شهر شعبان شنه ١٠٥١	By command of the Shāh, our master, the excellent ʿAbd al-Razzāq Gilānī in Mashhad in the month of Shaʿbān in the year 1051.		None