Astrolabe Catalogue

The back contains 8 scales of the following types:

Type (click to view scale details)	Range & Units	Numbered	Geometry	Location
Degree	Degrees	Every 5 degrees	Circular, concentric	The entire outer circle on the back of an astrolabe.
Zodiacal signs	X - XXX, Zodiacal divisions, equal or unequal	Every 10	None	Circular scale immediately inside the outer scale - refers to the full circle
Calendar	0 - 30, Days of year	Every 5 days	Circular, concentric	Circular scale second in from the outer scale - refers to the full circle.
Unequal hours	1 - 12, 1/12 of daylight	Every hours	Angle	None
Shadow square	0 - 12, Feet	Every 3 feet	Box	Left hand vertical 'face' of the shadow square (in LL)
Shadow square	0 - 12, Feet	Every 3 feet	Box	Left hand bottom face of the shadow square (in LL)
Shadow square	0 - 12, Feet	Every 3 feet	Box	Right hand bottom face of the shadow square (in LR)
Shadow square	0 - 12, Feet	Every 3 feet	Box	Right hand vertical face of the shadow square (in LR)

The back is inscribed:

Transcription	Translation	Notes	Type
GEORGIVS HARTMAN NOREMBERGE, FACIEBAT ANNO MDXXXXII			Maker's signature