Date | ca. 1370 |
Place | England (?) |
Material | Brass |
Inventory no. | 47869 |
Acquisition | Presented by the Misses M. E. and L. C. Hyett and by The Friends of the Old Ashmolean in 1955 |
The head of the dragon, shown here, is one of the most common zoomorphic features found on European retes. The ends of the outer band on the rete, the Tropic of Capricorn, were often fashioned into star pointers that resembled the head and the tail of a dragon or serpent. The tail points at the star Deneb Algiedi; the head points at Antares (here named Alacrab).
Although zoomorphic features were more common on Arabic instruments than on European astrolabes, the use of the head and tail of the dragon seems to have been mainly a European practice. Along with this instrument, the other 'Chaucerian' astrolabe (inventory no. 49359) and the related group of 14th-century English astrolabes all fashion the Tropic of Capricorn into a serpent. There is little evidence of this practice on Arabic astrolabes.
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Mater
The mater and limb are of one-piece construction. Scales on the limb: equal hours scale; degree scale. More informationBack
The back contains 5 scales of the following types: Degree; Zodiacal signs; Calendar; Saints' Days; Shadow square. More informationRete, Pin & Wedge
The rete contains 21 stars. The rete contains zoomorphs: the tropic of capricorn ends in the head and tail of a dragon The zodiac on the rete is labelled: Aries , Taur9 , Gemi' , Canc' , Leo , Virgo , Libra , Scorpio , Sagittari9 , Capricorn9 , Aquari9 , Pisces .The rete is attached using a pin & wedge. More information
Rules & Alidades
Type | Details |
---|---|
Pointer | Double-ended, counter-changed. |
Alidade | Double-ended, counter-changed. |