Astrolabe Catalogue

 

Small image of astrolabe back with rules or alidades removed. Click to enlarge.
Date early 17th century
Place Europe
Material Brass
Inventory no. 54424
Acquisition Presented by J. A. Billmeir in 1957

Back



The back contains 1 scales of the following types:
Type
(click to view scale details)
Range & Units Numbered Geometry Location
Degree Degrees Every 10 degrees Circular, concentric None

Universal

The back contains a universal with a De Rojas projection. ‘Horae ante Merid’ numbered 1 to 12 along upper edge of projection. ‘Horae post Merid’ numbered 1 to 12 along lower edge . The universal contains the following:
Angle of inclination Direction of inclination Labelled Language Script Line style Notes
Tropic of Cancer N/A N/A Latin Mixed None
Tropic of Capricorn N/A N/A Latin Mixed None
Ecliptic N/A Top-right/bottom-left Latin Plain
The universal contains the following meridians:
Interval Style of line Number style Description
10° Plain European Modern every third line, i.e. the hour lines, are criss-crossed with arrow marks
The universal contains the following parallels:
Range Interval Style of line Number style Description
  Plain N/A
  30° Hatched N/A

The universal contains scales of the following types:
Type Range & Units Numbered Geometry Location
Zodiacal signs Degrees of ecliptic  degrees Linear The scales found along the central meridian on universals, usually a zodiac

Stars

The universal contains the following stars. Click on the star name or modern star name to search for other astrolabes with the same star.
Star name
(on instrument)
Modern star
(if known)
Mediation Declination Pointer
Oculus ♉ Aldebaran N/A N/A engraved
Caude ♌ Denebola N/A N/A engraved
Spica ♍ Spica N/A N/A engraved
Cor ♌ Regulus N/A N/A engraved
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