1ſame, not to ſerve for a neceſſary demonſtration, but to adorn a
Platonick Conceit; to which I will add another particular
vation of our Academick, which hath in it ſomething of
ble. Let us ſuppoſe amongſt the decrees of the divine Architect,
a purpoſe of creating in the World theſe Globes, which we
hold continually moving round, and of aſſigning the centre of
their converſions; and that in it he had placed the Sun immoveable,
and had afterwards made all the ſaid Globes in the ſame place,
and with the intended inclinations of moving towards the Centre,
till they had acquired thoſe degrees of velocity, which at firſt
med good to the ſame Divine Minde; the which being acquired,
we laſtly ſuppoſe that they were turned round, each in his Sphere
retaining the ſaid acquired velocity: it is now demanded, in
what altitude and diſtance from the Sun the place was where the
ſaid Orbs were primarily created; and whether it be poſſible that
they might all be created in the ſame place? To make this
ſtigation, we muſt take from the moſt skilfull Aſtronomers the
magnitude of the Spheres in which the Planets revolve, and
wiſe the time of their revolutions: from which two cognitions is
gathered how much (for example) Jupiter is ſwifter than
turne; and being found (as indeed it is) that Jupiter moves more
ſwiftly, it is requiſite, that departing from the ſame altitude,
piter be deſcended more than Saturne, as we really know it is, its
Orbe being inferiour to that of Saturne. But by proceeding
wards, from the proportions of the two velocities of Jupiter and
Saturne, and from the diſtance between their Orbs, and from the
proportion of acceleration of natural motion, one may finde in
what altitude and diſtance from the centre of their revolutions,
was the place from whence they firſt departed. This found out,
and agreed upon, it is to be ſought, whether Mars deſcending
from thence to his Orb, the magnitude of the Orb, and the
locity of the motion, agree with that which is found by
tion; and let the like be done of the Eartb, of Venus, and of
Mercury; the greatneſs of which Spheres, and the velocity of
their motions, agree ſo nearly to what computation gives, that it
is very admirable.
Platonick Conceit; to which I will add another particular
vation of our Academick, which hath in it ſomething of
ble. Let us ſuppoſe amongſt the decrees of the divine Architect,
a purpoſe of creating in the World theſe Globes, which we
hold continually moving round, and of aſſigning the centre of
their converſions; and that in it he had placed the Sun immoveable,
and had afterwards made all the ſaid Globes in the ſame place,
and with the intended inclinations of moving towards the Centre,
till they had acquired thoſe degrees of velocity, which at firſt
med good to the ſame Divine Minde; the which being acquired,
we laſtly ſuppoſe that they were turned round, each in his Sphere
retaining the ſaid acquired velocity: it is now demanded, in
what altitude and diſtance from the Sun the place was where the
ſaid Orbs were primarily created; and whether it be poſſible that
they might all be created in the ſame place? To make this
ſtigation, we muſt take from the moſt skilfull Aſtronomers the
magnitude of the Spheres in which the Planets revolve, and
wiſe the time of their revolutions: from which two cognitions is
gathered how much (for example) Jupiter is ſwifter than
turne; and being found (as indeed it is) that Jupiter moves more
ſwiftly, it is requiſite, that departing from the ſame altitude,
piter be deſcended more than Saturne, as we really know it is, its
Orbe being inferiour to that of Saturne. But by proceeding
wards, from the proportions of the two velocities of Jupiter and
Saturne, and from the diſtance between their Orbs, and from the
proportion of acceleration of natural motion, one may finde in
what altitude and diſtance from the centre of their revolutions,
was the place from whence they firſt departed. This found out,
and agreed upon, it is to be ſought, whether Mars deſcending
from thence to his Orb, the magnitude of the Orb, and the
locity of the motion, agree with that which is found by
tion; and let the like be done of the Eartb, of Venus, and of
Mercury; the greatneſs of which Spheres, and the velocity of
their motions, agree ſo nearly to what computation gives, that it
is very admirable.
The circular
tion is never
quired naturally,
without right
tion precede it.
Circular motion
perpetually
form.
tion is never
quired naturally,
without right
tion precede it.
Circular motion
perpetually
form.
The magnitude of
the Orbs, and the
velocity of the
tion of the Planets,
anſwer
ably, as if
ed from the ſame
place.
the Orbs, and the
velocity of the
tion of the Planets,
anſwer
ably, as if
ed from the ſame
place.
SAGR. I have hearkened to this conceit with extreme delight;
and, but that I believe the making of theſe calculations truly
would be a long and painfull task, and perhaps too hard for me
to comprehend, I would make a trial of them.
and, but that I believe the making of theſe calculations truly
would be a long and painfull task, and perhaps too hard for me
to comprehend, I would make a trial of them.
SALV. The operation indeed is long and difficult; nor could
I be certain to finde it ſo readily; therefore we ſhall refer it to
other time, and for the preſent we will return to our firſt
ſal, going on there where we made digreſſion; which, if I well
remember, was about the proving the motion by a right line of no
I be certain to finde it ſo readily; therefore we ſhall refer it to
other time, and for the preſent we will return to our firſt
ſal, going on there where we made digreſſion; which, if I well
remember, was about the proving the motion by a right line of no
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