Full text: de Sacrobosco, Johannes: Iohannis de Sacro Bvsto Libellvs de Sphaera : accessit eivsdem avtoris compvtvs ecclesiasticus, et alia quaedam, in studiosorum gratiam edita

179. XVIII.

Si enim intelligamus terram eſſe perfecte rotun
dam, ac æquabili ſuperficie ſine hiſce montibus ac
uallibus, quæ
D eus ut cætera condidit ad uſus homi-
num,
G eometrice oſtendi poteſt, quod per 360. ſta-
dia accreſcat tumor, ſeu altitudo ſeu profunditas
terræ pene pedes 250.

180. XIX.

I deoq;, ſi terra eſſet ita abſolute ſphærica, non
poſſemus oculis excipere ea, quæ diſtarent à nobis
180. ſtadijs, niſi ex æditiori turri ſeu ædificio, cuius
altitudo eſſet circiter 250 pedes, aut 185 cubitos, ſeu
ulnas, quibus in his regionibus utuntur fabri.

181. XX.

N unc quia terra est σφαιροειδ [...] ρ iuxta præcipu
as partes, & ut
P tolemæus loquitur, καϑ᾽ ὅλα τὰ
μερ [...] , ſeu, ut P linius inquit, ſi capita linearum com-
prehendantur ambitu, ita ut alibi ſint altißimi mon-
tes, alibi longo tractu ſumma planities,
M acrobij
ſententiam ipſa experientia comprobat.

182. XXI.

N am in regionibus non admodum montoſis, ſed
mediocri camporum planitiæ, uel ex colle uel altiori
ædificio, uiſus ad 3 aut 4. fere miliaria in ſuperficie
terræ porrigitur, id quod à nautis in ipſo æquore

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