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 5 degrees	Circular, concentric	outermost scale on the front of the limb
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	Days of year	days	Circular, concentric	Circular scale second in from the outer scale - refers to the full circle.
Windrose	None		Circular, concentric	Circular scale third in from the outer scale - refers to the full circle.
Dominical letter	1600 - 1627, None		Circular, concentric	First circle within shadow square.
Solar cycle	1600 - 1627, None		Circular, concentric	Second circle within shadow square.
Golden number	1600 - 1618, None		Circular, concentric	Third circle within shadow square.
Epact	1600 - 1618, None		Circular, concentric	Forth circle within shadow square.
Perpetual calendar	None		Circular, concentric	Upper left quadrant (inside circular scales)
Perpetual calendar	None		Circular, concentric	Upper right quadrant (inside circular scales)
Shadow square	0 - 12, Fingers	Every 2 fingers	Box	Right hand vertical face of the shadow square (in LR)
Shadow square	0 - 12, Fingers	Every 2 fingers	Box	Left hand vertical 'face' of the shadow square (in LL)
Shadow square	0 - 12, Fingers	Every 2 fingers	Box	Left hand bottom face of the shadow square (in LL)
Shadow square	0 - 12, Fingers	Every 2 fingers	Box	Right hand bottom face of the shadow square (in LR)

The back is inscribed:

Transcription	Translation	Notes	Type
Fr. Morillard Lugdunen. faciebat Narb. Anno M.VIc	Fr. Morillard of Lugdunen made it at Narbonne, 1600		Maker's signature