Dot Porter, Curator, Digital Research Services at the University of Pennsylvania Library, offers a video orientation to Penn Library’s LJS 216, Tractatum de spera., by Joannes deSacro Bosco . This manuscript was written in Paris, between 1256 and 1270, in Latin, and it is a collection of three scientific works, nearly contemporary with the life of the author: one work on cosmology and astronomy, one on arithmetic, and one on the division of time according to the movements of the sun and moon.
See the full online facsimile of this work in Penn in Hand.
The Schoenberg Institute for Manuscript Studies 