Astrolabe Catalogue

The back contains 13 scales of the following types:

Type (click to view scale details)	Range & Units	Numbered	Geometry	Location
Degree	0 - 90, Degrees of arc	Every 5 degrees	Circular, concentric	The entire outer circle on the back of an astrolabe.
Zodiacal signs	Zodiacal sign	Not numbered	Circular, concentric	Circular scale immediately inside the outer scale - refers to the full circle
Terms	0° Aries - 30° Pisces, Zodiacal divisions, equal or unequal	At each term	Circular, concentric	Circular scale second in from the outer scale - refers to the full circle.
Faces	0° Aries - 30° Pisces, Astrological face	Not numbered	Circular, concentric	Circular scale third in from the outer scale - refers to the full circle.
Triplicities	0° Aries - 30° Pisces, None	Not numbered	Circular, concentric	Circular scale fourth in from the outer scale - refers to the full circle.
Calendar	Days of year	Every 5 days days	Circular, concentric	Circular scale fifth in from the outer scale - refers to the full circle.
Lunar Mansions	29° Pisces - 28° Pisces, Lunar mansion		Circular, concentric	Circular scale sixth in from the outer scale - refers to the full circle.
Altitude	0 - 90, Degrees of arc	Every 5 degrees	Inner Circular, concentric	Upper left quadrant (inside circular scales)
Altitude	0 - 90, Degrees of arc	Every 5 degrees	Inner Circular, concentric	Upper right quadrant (inside circular scales)
Cotangent	0 - 30, Feet	Every 5 feet	Inner Circular, concentric	Lower left quadrant of outer circular on back of instrument.
Cotangent	0 - 45, Fingers	Every 5 fingers	Inner Circular, concentric	Lower right quadrant of outer circular on back of instrument.
Unequal hours	1 - 12, 1/12 of daylight	Every 1 hours	Arc	Lower right quadrant
Shadow square	1 - 12, Fingers	Every 3 fingers	Box	Right hand bottom face of the shadow square (in LR)
Shadow square	1 - 12, Fingers	Every 3 fingers	Box	Right hand vertical face of the shadow square (in LR)
Triplicities	Zodiacal divisions, equal or unequal		Inner Box	Lower left quadrant

The back is inscribed:

Transcription	Translation	Notes	Type
للملك الأشرف صنعه عبد الكريم المصري الأصطرلابي في سنة خكه الهجرية	Made by the astrolabist ʿAbd al-Karīm al-Miṣrī, to al-Malik al-Ashraf in the year 625 A.H.	Inscription below and to the left of the central hole	Maker's signature