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

generaly. And thus knowe I this conclusioun. And for the

more declaracioun, lo here the figure.

[13.] To knowe the altitude of the sonne in middes of the day, that is cleped the altitude meridian.

[Ad cognoscendum altitudinem solis in medio diei, que vocatur altitudo meridiana.]

Set the degree of the sonne up-on the lyne meridional, and

rikene how many degrees of almikanteras ben by-twixe thyn est

orisonte and the degree of the sonne. And tak ther thyn altitude

meridian; this is to seyne, the heyest of the sonne as for that day.

5

So maystow knowe in the same lyne, the [heyest cours] that any