Chaucer's Works, Volume 3 — The House of Fame; The Legend of Good Women; The Treatise on the Astrolabe; The Sources of the Canterbury Tales

by Geoffrey Chaucer

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everemo the arysing of 15 degrees of the equinoxial maketh an

houre equal of the clokke. This equinoxial is cleped the girdel

of the firste moeving, or elles of the [angulus] primi motus vel

primi mobilis. [And nota], that firste moeving is cleped 'moeving'

of the firste moevable of the 8 spere, whiche moeving is fro est to

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west, and eft agayn in-to est; also it is clepid 'girdel' of the first

moeving, for it departeth the firste moevable, that is to seyn, the

spere, in two ilyke parties, evene-distantz fro the poles of this