Clavius, Christoph, In Sphaeram Ioannis de Sacro Bosco commentarius

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ARCHIMEDIS tempore (vt ipſemet in lib. de arenæ numero refert)
22Arenæ nu-
merum
ſe-
cũdũ
quoſ
dam
eſſe in
finitum
, ſe-
quoſ-
uero fi-
nitũ
quidẽ,
ſed
ab om-
ni
dato nu-
mero
ſupe-
rari
.
arbitrabantur nonnulli, numerum arenæ, non quidem ſolum eius, quæ circa
Syracuſas
, &
reliquam Siciliam, ſed & illius, quæ in omni regione habitabili,
pariter
atque in habitabili continetur, infinitum eſſe.
Alij uero, non quidẽ eſſe
inſinitum
dicebant eum arenæ numerum, propterea quòd infinitum dari non
poſſit
, ſed nullum dari poſſe determinatũ numerum credebant, qui illius mul-
titudinem
exuperaret, aut ei par eſſet;
immo uero potius è contrario, nume-
rum
quemcunque propoſitum, &
determinatum, à numero illo arenæ ſupera-
tum
iti.
Ex quo infert Archimedes, eos, qui ita opinantur, ſi eiuſmodi aerenæ
aceruum
animo comprehenderent, cuiuſmodi eſſet, ſi uniuerſæ terra, reple-
to
in ea mari, &
cauitatibus omnibus, altiſſimorum montium uertices exæ-
quaret
, atque huius ipſius rurſus alterum multiplicem excogitarent, ſine ul-
lo
dubio exiſtimaturos, illius multitudinem numeros omnes longe, multũq́;
ſuperare. Horum omnium errorem Archimedes in eo lib. quem de Arenæ nu
mero
inſcripſit, Geometrice, &
quidem acutiſſime reſellit, inueſtigãs numerũ,
qui
non ſolum arenæ multitudinem ſuperet, quæ terræ undique repletæ, ut di
ximus
, æqualis eſſet, ſed etiam quæ ipſi mundo (poſito etiam mundo multo
maiore
, quàm re ipſa eſt) parem haberet magnitudinem.
Atque hoc eſt Archi-
33Archime-
dis
propoſi
tum
in lib.
de
arenæ
numero
.
medi propoſitum in lib.
de arenæ numero, ubi prius ſubtili quadam ratione de
monſtrat
, quanam uia diſtantia Solis à terra ſit inueſtiganda, inuento prius an
gulo
, qui minor ſit angulo, quem duæ lineæ rectę à centro uiſus egredientes,
Solemq́ue
tangentes comprehendunt, qua de re conſule eius ſcripta, &
com-
mentarios
Federici Commandini.

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