Equatorium (Accepted)

An equatorium is a medieval astronomical instrument, dating from the 11^th 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 15^th C. French artifact in the Oxford Museum of the History of Science.  See also astrolabe, clock, sphere, sundial.

Alfred of Durham bears:  Paly 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.