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

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1effata, quibus 30 milliaria Italica videntur
mediocris visûs diſtantia: quare multò pro
babilior ei apparebat Macrobrii atque Era
toſthenis ſententia diſtantiam huiuſmodi ſta,
ſtijs 180 definientium. Nos igitur ad exa
minandum contulimus telluris ambitum ab
Eratoſthene conſtitutum, an cum illa ſemi
diametto ſtadiorum 180 cohæreret: Eui

dentiſſimis enim, vt Macrobius loquitur lib.
1. in ſomn. Scip. cap. 20. & indubitabilibus
dimenſionibus conſtat vniuerſæ terræ ambitum,
quæ vbicunque vel incolitur, vel inhabitabilis
iacet, habere ſtadiorum millia ducenta quin
quaginta duo. Cum verò huius peripheriæ
pars milleſima quadringenteſima ſint ſtadia
180, per quæ directa ab oculis acies pergit,
arcus BA gr.o.m.15.ſec.25. Ter. 42. &c.
metitur angulum BCD in centro factum.
At quoniam peripheria ponitur ſtad 252000
eſt diameter minor verâ ſtad. (80181 9/11), maior
autem verâ (80233 41/223): quarè ſumpto medio
Arithmetico e diameter AC ſtad. 80207 1/2,
& ſemidiameter CA ſtad. 40103 3/4. Fiat igitur
vt CB 99998.99293. ſinus complementi
gr.o.m.15.ſec. 25. Ter.42. ad CD Radium
100000.00000, ita CB ſtad.40103 3/4 ad CD
ſtad, 40104, & ped.92. Demptâ autem CA

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