Astrolabe Catalogue

The back contains 6 scales of the following types:

Type (click to view scale details)	Range & Units	Numbered	Geometry	Location
Degree	0 - 90, Degrees	Every 10 degrees	Circular, concentric	The entire outer circle on the back of an astrolabe.
Zodiacal signs	0 - 30, Zodiacal divisions, equal or unequal	Every 10	Circular, concentric	Circular scale immediately inside the outer scale - refers to the full circle
Calendar	first day of month - last day of month, Days of year	Every 10 days and end of the month days	Circular, concentric	Circular scale second in from the outer scale - refers to the full circle.
Shadow square	0 - 12, Fingers	Every 3 fingers	Box	Left hand vertical 'face' of the shadow square (in LL)
Shadow square	0 - 12, Fingers	Every 3 fingers	Box	Right hand vertical face of the shadow square (in LR)
Shadow square	0 - 12, Fingers	Every 3 fingers	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)
Unequal hours	1 - 12, 1/12 of daylight	Every 1 hours	Arc	Upper left quadrant (inside circular scales)
Unequal hours	1 - 12, 1/12 of daylight	Every 1 hours	Arc	Upper right quadrant (inside circular scales)

The back is inscribed:

Transcription	Translation	Notes	Type
Io: Dom; Feciolus Trident: faciebat	Giovanni Domenico Feciolo of Trent made this	This inscription is engraved elow the shadow square	Maker's signature
Astrolabium hoc ex tabulis Bergensibus construendum sibi curavit Julius Caesar luchinus Bononiae anno 1558	In 1558, Julius Caesar Luchino fo Bologna arranged to have this astrolabe made for himself from according to the Tabulae Bergenses	This inscription is engraved within the unequal hour diagram	Owner's mark