The Canterbury Tales and Other Works of Chaucer (Middle E...

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Chaucer's *Treatise on the Astrolabe* (c. 1391) is a technical instructional manual in the tradition of medieval astronomical pedagogy, adapted from Arabic and Latin sources — primarily Messahala — into English prose. Addressed directly to his ten-year-old son Lewis, it explains the physical parts of the astrolabe and outlines a five-part curriculum covering its practical use, astronomical tables (stellar coordinates, solar declination, city longitudes), lunar motion, and an introduction to astrological theory calibrated to the latitude of Oxford. The work is notably self-deprecating in framing: Chaucer explicitly disclaims originality, calling himself a "lewd compilator" of earlier astronomers, and justifies the vernacular not as a concession but as fully legitimate — arguing that English serves its readers exactly as Greek, Arabic, Hebrew, and Latin serve theirs. The opening section preserved here focuses on Part 1, methodically describing every physical feature of the instrument — the mother plate, the rete, the alidade, the pin — in plain, repetitive prose deliberately chosen for a child's comprehension. Its most distinctive quality is the fusion of tender domestic address with rigorous technical content, making it one of the earliest surviving scientific prose works in English and an unusually personal document for its genre.

The Canterbury Tales and Other Works of Chaucer (Middle E...

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