Clavius, Christoph, In Sphaeram Ioannis de Sacro Bosco commentarius

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10568Comment. in I. Cap. Sphæræ
Qvod igitur Luna inſimo in loco ſit poſita, hac ratione demonſtrari po-
teſt
.
Corpus lucidum, quò altius & remotius eſt a terra, cæteris paribus, um
11Lunã poſi-
tam
eſſe in
infimo
lo-
co
, proba-
@ut
ex um-
bra
.
bræ corporum minores apparent in plano Horizontis, &
quò propinquius eſt
terræ
corpus Luminoſum, eo longiores umbras corpora proijciunt;
ut uidere
licet
in hac figura:
In qua utrumque aſtrum eandem habet altitudinem ſupra
Horizontem
A B, reſpectu centri mundi, id eſt, obtinet eundem locum uerum
reſpectu
Horizontis, quamuis in uiſo loco diſcrepent, &
tamen inferius aſtrum
longius
proijcit umbram gnomonis C D, puta in punctum E, quàm ſuperius,
umbram
eiuſdem gnomonis tantum proijcit in punctum F:
Atqui umbra gno
monis
erecti, ſplendente Sole, minor eſt, quam umbra eiuſdem gnomonis, Lu-
na
lucente, cæteris omnibus paribus exiſtentibus, id eſt, æqualibus cum Sole
13[Figure 13] gradibus, diuerſo tamen tempore, ab
Horizonte
diſtante;
quod facile quiuis
experiri
poterit, ſi ſignetur tempore æqui
noctij
altitudo Solis meridiana, Sole ui-
delicet
tenẽte principiũ Aries, aut Libra,
quæ
altitudo Romę eſt fere grad.
48.
noteturq́ue in aliquo plano gnomonis
umbra
.
Poſtea idem fiat, Luna exiſtente
in
eodem loco Zodiaci, in quo ante fuit
Sol
, hoc eſt, ĩ prĩcipio Ariete, vel Libra, &

tenẽte
Meridianum circulum, carenteq́.
omni latitudine. Deprehendetur nãq,
umbra
gnomonis, ſplendente Luna, multo longior, quam lucente Sole, cum
altitudo
, ſeu diſtantia utriuſq.
planetæ ab Horizonte ſit eadem, nimirum grad.
48
.
reſpectu centri terræ. Sequiturigitur, ſphęrã Solis longe eſſe ſuperiorem, ꝗ̃
Lunæ
.
Idẽ de Luna reſpectu Solis diximus, accõmodari poteſt reſpectu alio-
planetarum;
ꝗ̃ uis. n. alij planetę non ita ſplendeant, ut vmbras proijciant, ſci
ri
poteſt, quantum eorum radij per gnomonis uerticem proijciantur.
Quam
ob
rem citra omnẽ controuerſiã cõſtat, Lunã omnibus eſſe planetis inferiorẽ.

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