Astrolabe Catalogue


Small image of astrolabe back with rules or alidades removed. Click to enlarge.
Date 1584
Maker Philippe Danfrie
Place Paris
Material Wood
Inventory no. 34268
Acquisition Presented by Lewis Evans in 1924


Paper covered wood.

The back contains 6 scales of the following types:
(click to view scale details)
Range & Units Numbered Geometry Location
Degree 0 - 90, Degrees of arc  degrees Circular, concentric The entire outer circle on the back of an astrolabe.
Zodiacal signs Zodiacal divisions, equal or unequal Every 5  Circular, concentric Circular scale immediately inside the outer scale - refers to the full circle
Calendar Days of year Every 5 days Circular, eccentric Circular scale third in from the outer scale - refers to the full circle.
Shadow square Fingers Every 3 fingers Box None
Dominical letter 1583 - None   Inner Circular, concentric Upper left quadrant (inside circular scales)
Epact 1583 - None   Inner Circular, concentric Upper right quadrant (inside circular scales)
The back is inscribed:
Transcription Translation Notes Type
Philipvs Danfrieus, Siderographus Regius Generalis Lutetiae exarabat, Anno Salutis 1584 Maker's signature
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