Treatise on The Astrolabe : addressed to his son Lowys / by Geoffrey Chaucer ; edited from the earliest MSS. by Walter W. Skeat

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Title

Author

Chaucer, Geoffrey, d. 1400

Editor

Skeat, Walter W. (Walter William), 1835-1912

Publication

London: N. Trübner & Co.

1872

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http://name.umdl.umich.edu/ChaucerAstr

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"Treatise on The Astrolabe : addressed to his son Lowys / by Geoffrey Chaucer ; edited from the earliest MSS. by Walter W. Skeat." In the digital collection Corpus of Middle English Prose and Verse. https://name.umdl.umich.edu/ChaucerAstr. University of Michigan Library Digital Collections. Accessed June 2, 2024.

Pages

20.To knowe the declinacioun of any degree in the zodiak fro the equinoxial cercle, &c.

[Ad cognoscendum declinacionem alicuius gradus [in] zodiaco [a] circulo equinoctiali.]

¶ Set the degree of any signe vp-on the lyne Meridional, & rikne [h]is altitude in Almykanteras fro the Est Orizonte vp to the same degree set in the forseide lyne, & set ther a prikke. ¶ turne vp thanne thy Riet, and set the heued of aries or libra in the same Meridional lyne, & set ther a-nother prikke. ¶ & whan þat this is don, considere the [folio 17b] Altitudes of hem bothe ; for sothly the difference of thilke altitudes is the declinacion of thilke degre fro the equinoxial. ¶ & yif so be þat thilke degree be northward fro the equinoxial, than is his declinacion north ; ¶ yif it be sowthward, than is it sowth. ¶ & for the more declaracioun, lo here thi figure.