Galilei, Galileo, The systems of the world, 1661

Table of figures

< >
[Figure 11]
[Figure 12]
[Figure 13]
[Figure 14]
[Figure 15]
[Figure 16]
[Figure 17]
[Figure 18]
[Figure 19]
[Figure 20]
[Figure 21]
[Figure 22]
[Figure 23]
[Figure 24]
[Figure 25]
[Figure 26]
[Figure 27]
[Figure 28]
[Figure 29]
[Figure 30]
[Figure 31]
[Figure 32]
[Figure 33]
< >
page |< < of 948 > >|
1the Axis of the grand Orb, the Earths centre being in the
tial point of Capricorn.
Suppoſing therefore the Terreſtrial
Globe to have its centre in the point Capricorn, we will deſcribe
its Poles and Axis A B, inclined upon the diameter Capricorn
Cancer 23 degrees and an half; ſo that the angle A Capricorn
Cancer cometh to be the complement of a Quadrant or Radius,
that is, 66 degrees and an half; and this inclination muſt be
derſtood to be immutable, and we will ſuppoſe the ſuperiour
Pole A to be Boreal, or North, and the other Auſtral, or South.
Now imagining the Earth to revolve in it ſelf about the Axis A B
in twenty four hours, from Weſt to Eaſt, there ſhall by all the
points aſſigned in its ſuperſicies, be circles deſcribed parallel to
each other.
We will draw, in this firſt poſition of the Earth,
the greateſt C D, and thoſe two diſtant from it gr. 23. and an
half, E F above, and G M beneath, and the other two extream
ones I K and L M remote, by thoſe intervals from the Poles A
and B; and as we have marked theſe five, ſo we may imagine
numerable others, parallel to theſe, deſcribed by the
ble points of the Terreſtrial ſurface.
Next let us ſuppoſe the
Earth, with the annual motion of its centre, to transferre it ſelf
into the other places already marked; but to paſſe thither in ſuch
a manner, that its own Axis A B ſhall not only not change
nation upon the plain of the Ecliptick, but ſhall alſo never vary
direction; ſo that alwayes keeping parallel to it ſelf, it may
continually tend towards the ſame part of the Univerſe, or, if
you will, of the Firmament, whereas, if we do but ſuppoſe it
prolonged, it will, with its extream termes, deſigne a Circle
rallel and equal to the grand Orb, Libra Capricorn Aries Cancer,
as the ſuperiour baſe of a Cylinder deſcribed by it ſelf in the
nual motion above the inferiour baſe, Libra Capricorn Aries
Cancer.
And therefore this immutability of inclination
nuing, we will deſign theſe other three figures about the centres
Aries, Cancer, and Libra, alike in every thing to that firſt
ſcribed about the centre Capricorn.
Now we will conſider the
firſt figure of the Earth, in which, in regard the Axis A B is
clined from perpendicularity upon the diameter Capricorn
cer 23 degrees and an half towards the Sun O, and the arch A I
being alſo 23 degrees and an half, the illumination of the Sun
will illuſtrate the Hemiſphere of the Terreſtrial Globe expoſed
towards the Sun (of which, in this place, half is to be ſeen)
vided from the obſcure part by the Terminator of the light
I M, by which the parallel C D, as being a grand circle, ſhall
come to be divided into equal parts, but all the reſt into parts
equal; being that the terminator of the light I M paſſeth not
by their Poles A B, and the parallel I K, together with all the reſt

Text layer

  • Dictionary
  • Places

Text normalization

  • Original
  • Regularized
  • Normalized

Search


  • Exact
  • All forms
  • Fulltext index
  • Morphological index