upennmanuscripts:LJS 216 - Tractatum de spera … [etc.]This manuscript is a collection of three scien

upennmanuscripts:LJS 216 - Tractatum de spera … [etc.]This manuscript is a collection of three scientific works: Sphaera Mundi, by Johannes de Sacro Bosco, on cosmology and astronomy, Algorismus, or Tractatus de arte numerandi, on arithmetic, and Computus lunaris, or De computo ecclesiastico, on the division of time according to the movements of the sun and moon. It was possibly written in Paris between 1256 and 1270.Do you remember? We have seen this text, already. Check here!Enjoy the facsimile here, or the video orientation here! -- source link

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