Treatise on the Astrolabe, of Geoffrey Chaucer

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. Now, the most remarkable anomaly attributable to Chaucer, is his adoption of 23(deg) 50' as the obliquity of the ecliptic that being very much in excess of its known quantity in his time.