Equatorium

Equatorium (Accepted)

Equatorium (Accepted)

An equatorium is a medieval astronomical instrument, dating from the 11th Century.  Based on the Ptolemaic theory of equants (epicycles, eccentrics, &c), it was used for predicting planetary positions.  No examples are known in period armory; the illustration is taken from a 15th C. French artifact in the Oxford Museum of the History of Science.  See also astrolabe, clock, sphere, sundial.

Alfred of Durham bears:  Paly sans nombre azure and argent, on a bend sinister engrailed between a hemispheric astrolabe and an equatorium Or, three estoiles gules.

Alya Zengerlin bears:  Per bend argent and sable, two mullets in bend purpure and an equatorium Or.

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