Galilei, Galileo, The systems of the world, 1661

Page concordance

< >
Scan Original
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
< >
page |< < of 948 > >|
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.

Text layer

  • Dictionary
  • Places

Text normalization

  • Original
  • Regularized
  • Normalized

Search


  • Exact
  • All forms
  • Fulltext index
  • Morphological index