1underſtand that we ſhould very commodiouſly ſalve all the
nomena of theſe two Planets, with two Circles, in like manner,
drawn about the Sun, and this firſt for Jupiter, marking it E L, and
another above that for Saturn marked F
nomena of theſe two Planets, with two Circles, in like manner,
drawn about the Sun, and this firſt for Jupiter, marking it E L, and
another above that for Saturn marked F
Mars at its
ſition to the Sun
ſhews to be ſixty
times bigger than
towards the
junction.
ſition to the Sun
ſhews to be ſixty
times bigger than
towards the
junction.
Jupiter and
turn do likewiſe
compaſſe the Earth,
and the Sun.
turn do likewiſe
compaſſe the Earth,
and the Sun.
The
tion and receſſion of
the three ſuperiour
Planets, importeth
double the Suns
ſtance.
tion and receſſion of
the three ſuperiour
Planets, importeth
double the Suns
ſtance.
SALV. You have behaved your ſelf bravely hitherto. And
becauſe (as you ſee) the approach and receſſion of the three
periour Planets is meaſured with double the diſtance between the
Earth and Sun, this maketh greater difference in Mars than in Ju-
becauſe (as you ſee) the approach and receſſion of the three
periour Planets is meaſured with double the diſtance between the
Earth and Sun, this maketh greater difference in Mars than in Ju-
piter, the Circle D I, of Mars, being leſſer than the Circle E L,
of Jupiter, and likewiſe becauſe this E L, is leſſe than this Circle
F M, of Saturn, the ſaid difference is alſo yet leſſer in Saturn than
in Jupiter, and that punctually anſwereth the Phænomena.
It remains now that you aſſign a place to the Moon.
The difference of
the apparent
nitude leſſe in
turn, than in
ter, an dn Jupiter
than in Mars, and
why.
the apparent
nitude leſſe in
turn, than in
ter, an dn Jupiter
than in Mars, and
why.
SIMP. Following the ſame Method (which ſeems to me very
concluſive) in regard we ſee that the Moon cometh to conjunction
and oppoſition with the Sun, it is neceſſary to ſay, that its circle
encompaſſeth the Earth, but yet doth it not follow, that it muſt
environ the Sun, for then at that time towards its conjunction, it
would not ſeem horned, but alwayes round and full of Light.
Moreover it could never make, as it often doth, the Eclipſe of the
Sun, by interpoſing betwixt it and us; It is neceſſary therefore
to aſſign it a circle about the Earth, which ſhould be this N P, ſo
that being conſtituted in P, it will appear from the Earth A, to be
in conjunction with the Sun, and placed in N, it appeareth oppoſite
to the Sun, and in that poſition it may fall under the Earths
dow, and be obſcured.
concluſive) in regard we ſee that the Moon cometh to conjunction
and oppoſition with the Sun, it is neceſſary to ſay, that its circle
encompaſſeth the Earth, but yet doth it not follow, that it muſt
environ the Sun, for then at that time towards its conjunction, it
would not ſeem horned, but alwayes round and full of Light.
Moreover it could never make, as it often doth, the Eclipſe of the
Sun, by interpoſing betwixt it and us; It is neceſſary therefore
to aſſign it a circle about the Earth, which ſhould be this N P, ſo
that being conſtituted in P, it will appear from the Earth A, to be
in conjunction with the Sun, and placed in N, it appeareth oppoſite
to the Sun, and in that poſition it may fall under the Earths
dow, and be obſcured.
The Moons Orb
invironeth the
Earth, but not the
Sun.
invironeth the
Earth, but not the
Sun.
SALV. Now, Simplicius, what ſhall we do with the fixed
ſtars? Shall we ſuppoſe them ſcattered through the immenſe
ſes of the Univerſe, at different diſtances, from any one
nate point; or elſe placed in a ſuperficies ſpherically diſtended
bout a centre of its own, ſo that each of them may be
diſtant from the ſaid
ſtars? Shall we ſuppoſe them ſcattered through the immenſe
ſes of the Univerſe, at different diſtances, from any one
nate point; or elſe placed in a ſuperficies ſpherically diſtended
bout a centre of its own, ſo that each of them may be
diſtant from the ſaid
The probable
ſituation of the
fixed ſtars.
ſituation of the
fixed ſtars.
SIMP. I would rather take a middle way; and would aſſign
them an Orb deſcribed about a determinate centre and comprized
within two ſpherical ſuperficies, to wit, one very high, and
cave, and the other lower, and convex, betwixt which I would
them an Orb deſcribed about a determinate centre and comprized
within two ſpherical ſuperficies, to wit, one very high, and
cave, and the other lower, and convex, betwixt which I would
conſtitute the innumerable multitude of ſtars, but yet at divers
titudes, and this might be called the Sphere of the Univerſe,
ing within it the Orbs of the planets already by us deſcribed.
Which ought to
be accounted the
ſphere of the
verſe.
be accounted the
ſphere of the
verſe.
SALV. But now we have all this while, Simplicius, diſpoſed the
mundane bodies exactly, according to the order of Copernicus,
and we have done it with your hand; and moreover to each of
them you have aſſigned peculiar motions of their own, except to
the Sun, the Earth, and ſtarry Sphere; and to Mercury with
Venus, you have aſcribed the circular motion about the Sun,
mundane bodies exactly, according to the order of Copernicus,
and we have done it with your hand; and moreover to each of
them you have aſſigned peculiar motions of their own, except to
the Sun, the Earth, and ſtarry Sphere; and to Mercury with
Venus, you have aſcribed the circular motion about the Sun,