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

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1
quia nulla Solis particula ad perpendiculum
imminet corpori, quod luce afficitur, iņ
ſpem erigebar aliquid deprehendendi ex ſpa­
tio circa Syenen ab antiquis apud Cleome­
dem obſeruato, in quo gnomones nullam
proijciunt vmbram meridianam Sole Tro­
picum Cancri percurrente.
Si enim in pla­
no AB erigatur ſtylus TI perpendicularis,
cui immineat Solis extremus limbus O, nul­
la fit vmbra, quia quamuis ab alio extremo S
veniat radius SN vltimus, & intrà ſpatium
12[Figure 12]
TN nullus alius ve­
niat radius ab eodem
puncto S radios in or­
bem diffundente, in­
trà illud tamen ſpa­
tium TN veniunt
radij à cæteris om­
nibus punctis inter
S & O intermediis:
quare nec vmbra vl­
la aut penumbra obſeruari poteſt.
At ſi ſty­
lus in LM fuerit, proiicit vmbram LP, in­
trà quod ſpatium nullus cadit radius dire­
ctus á punctis O & S aut intermediis; penum­
bra verò ex P ad B procedit, donec in B me­
ra lux incipiat.
Cum itaque ſpatio 300 ſta­
diorum gnomones vmbram non proiicerent,

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