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

and after the quantitee of his declinacioun, be rekned fro the

ecliptik lyne; fro which lyne alle planetes som tyme declynen

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north or south, save only the for-seide sonne. And for the more

declaracioun, lo here thy figure.

[18.] To knowe the degrees of the longitudes of fixe sterres after that they ben determinat in thin Astrolabie, yif so be that they ben trewly set.

[Ad cognoscendum gradus longitudinis de stellis fixis que determinantur in astrolabio, sicut in suis locis recte locentur.]

Set the centre of the sterre up-on the lyne meridional, and tak

keep of thy zodiak, and loke what degree of any signe that sit on

the same lyne meridional at that same tyme, and tak the degree in