upennmanuscripts: Theorica motus… volvelle on Page 7 of LJS 64, a manuscript copy of Illustra


upennmanuscripts: Theorica motus… volvelle on Page 7 of LJS 64, a manuscript copy of Illustra
upennmanuscripts: Theorica motus… volvelle on Page 7 of LJS 64, a manuscript copy of Illustra