semicircularis
sole existente prope ortum vel occasum, apparet iris ~is
os ~re
iterum lumen ipsum dilatatur in pyramidem cujus medietas cadit in nubem, et facit per consequens impressionem †semicircuralem [l. semicircularem ]
si sol sit in horizonte, et materia sit preparata, apparet iris ~is vel major portio sphere
locus quidam inclusus ~is in modum theatri