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

[34.] To knowe sothly the degree of the longitude of the mone, or of any planete that hath no latitude for the tyme fro the ecliptik lyne.

[Ad cognoscendum veraciter gradum de longitudine lune, vel alicuius planete qui non habet longitudinem pro tempore causanto linea ecliptica.]

Tak the altitude of the mone, and rikne thyn altitude up among

thyne almikanteras on which syde that the mone stande; and set

there a prikke. Tak thenne anon-right, [up-on the mones syde],

the altitude of any sterre fix which that thou knowest, and set his

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centre up-on his altitude among thyn almikanteras ther the sterre

is founde. Waite thanne which degree of the zodiak toucheth the

prikke of the altitude of the mone, and tak ther the degree in