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St John's College MS. 17
Thorney Computus
Thorney Abbey, England, 1110
This manuscript has been digitised here.
To consult the physical manuscript, contact the St John's Library Special Collections.
All images on this page have been reproduced with the kind permission of the The President and Fellows of St John's College, Oxford.
An expansive digital scholarly guide, The Calendar and the Cloister, has been devoted to this manuscript.
Featured here are two figures: f. 7v depicts Byrhtferth's diagram, a visual summary of the harmony of the universe, and f. 8rb depicts the sphere of Petosiris, a device for diagnosing the outcome of a patient's illness by arithmetical operations.
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