Full text: de Sacrobosco, Johannes: Sphaera Ioannis de Sacro Bosco emendata


SPHAERAE IOAN. firmamenti, non contingeret medietatem cœ-
li videri.

Item, ſi intelligatur ſuperficies plana ſuper
centrum terræ, diuidens eam in duo æqualia,
& ipſum per conſequens firmamentum. Ocu-
lus igitur existens in terræ centro videret me-
dietatem cœli: & idem existens in ſuperfi-
cie terræ videret
eandem medieta-
tem. Ex his col-
ligitur, quòd in-
ſenſibilis eſt quã-

tit{as} terræ, quæ

eſt à ſuperficie ad

centrum, & per
conſequens, quan
tit{as} totius terræ inſenſibilis est respectu fir-
mamenti.

19.1.

0060-01

Dicit etiam Alfraganus, quòd minima ſtel-

larum fixarum viſu m [...] tabilium, maior est to-
ta terra: ſed ipſa ſtella, reſpectu totius firma-

menti, eſt ſicut punctus & centrum: multò igi-
tur fortius terra eſt punctus reſpectu firmamen

ti, cùm ſit minor ea.

19.1.

Diff. 4. &
22.

Quòd autem terra in medio omnium tenea-

tur immobiliter, cùm ſit ſummè grauis, ſic per-

ſuadere videtur eius grauit{as}. Omne graue na-

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