Casati, Paolo, Terra machinis mota : dissertationes geometricae, mechanicae physicae hydrostaticae

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1ſemidiametro, remanet AD ped. 242, alti­
tudo, ex qua proſpici poteſt in B ita, vt aſpe­
ctui pateant ſtadia 180. Quî autem fieri poſ­
ſit ab intuente ſimilem ſemper orbem vide­
ri, ſiuè vlteriùs acceſſerit, ſiue retrorſum re­
ceſſerit, Macrobius ipſe viderit: an ſemper
eam inueniat altitudinem, cui inſiſtat, vt
oculus ab extimâ telluris facie pedibus 242
ſemoueatur?
Horizontis igitur ſemidiame­
trum aut ſtadijs 180 minorem eſſe, aut non
ex humani corporis altitudine definiri ne­
ceſſe eſt.
XXXXVI
Authorum
aliquorum
lapſus iņ
statuendą
nimia viſus
distantia.
Cum verò ille labantem Macrobij ſen­
tentiam ſuffulcire aliquatenus ſe poſſe con­
ſideret, ſtadia 180 tribuendo non arcui AB,
ſed rectæ DB terram tangenti, quæ & radij
optici ex oculo D prodeuntis menſura eſt, &
arcu AB longior; operam demum ſe ludere
ſenſit, cum re ad Geometricam normam
reuocatâ tantam opticæ lineæ longitudinem
terrenæ magnitudini minimè congruere ma­
nifeſtè deprehendit, etiam ſi oculus à terrâ
pedum 50. interuallo AD ſeiunctus intelliga­
tur.
Quoniam enim quadratum Tangentis
BD, quæ ſtad.
180 ponitur, æquale eſt re­
ctangulo ADE, diuidatur quadratum ped.
11664.000000 per 50, & erit DE ped. 233
280000, hoc eſt ſtadiorum Græcorum (quæ

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