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Joannis de Sacrobosco
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Joannis de Sacrobosco : Textus de Sphaera
'Early examples of [Gabriel Harvey's] marginalia in [the fields of cosmology and astronomy] are found in the large 1527 folio containing Sacrobosco's "Textus de Sphaera", Bonetus's "Annuli ... super astrologiam" [...] and Euclid's first book of geometry translated into Latin by Boethius. On the title-page is Harvey's signature and the date "1580", which seems to have been the period for many of his annotations in this volume.'
