Galilei, Galileo
,
Discourse concerning the natation of bodies
,
1663
Text
Text Image
XML
Document information
None
Concordance
Figures
Thumbnails
Page concordance
<
1 - 30
31 - 60
61 - 77
>
Scan
Original
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
<
1 - 30
31 - 60
61 - 77
>
page
|<
<
of 77
>
>|
<
archimedes
>
<
text
>
<
body
>
<
chap
>
<
p
type
="
main
">
<
s
>
<
pb
pagenum
="
402
"/>
and future, eſpecially if the time be for many Moneths or Years; I
<
lb
/>
am therefore forced, with other Obſervations, and more exact than
<
lb
/>
the former, and in times more remote from one another, to correct
<
lb
/>
the Tables of ſuch Motions, and limit them even to the ſhorteſt
<
lb
/>
ment: for ſuch exactneſſe my firſt Obſervations ſuffice not; not only
<
lb
/>
in regard of the ſhort intervals of Time, but becauſe I had not as then
<
lb
/>
found out a way to meaſure the diſtances between the ſaid Planets
<
lb
/>
by any Inſtrument: I Obſerved ſuch Intervals with ſimple relation
<
lb
/>
to the Diameter of the Body of
<
emph
type
="
italics
"/>
Jupiter
<
emph.end
type
="
italics
"/>
; taken, as we have ſaid, by
<
lb
/>
the eye, the which, though they admit not errors of above a Minute,
<
lb
/>
yet they ſuffice not for the determination of the exact greatneſs of the
<
lb
/>
Spheres of thoſe Stars. </
s
>
<
s
>But now that I have hit upon a way of
<
lb
/>
king ſuch meaſures without failing, ſcarce in a very few Seconds, I will
<
lb
/>
continue the obſervation to the very occultation of
<
emph
type
="
italics
"/>
JVPITER,
<
emph.end
type
="
italics
"/>
<
lb
/>
which ſhall ſerve to bring us to the perfect knowledge of the
<
lb
/>
ons, and Magnitudes of the Orbes of the ſaid Planets, together
<
lb
/>
<
arrow.to.target
n
="
marg1394
"/>
<
lb
/>
alſo with ſome other conſequences thence ariſing. </
s
>
<
s
>I adde to theſe
<
lb
/>
things the obſervation of ſome obſcure Spots, which are
<
lb
/>
ed in the Solar Body, which changing, poſition in that, propounds
<
lb
/>
to our conſideration a great argument either that the Sun revolves in
<
lb
/>
it ſelfe, or that perhaps other Starts, in like manner as
<
emph
type
="
italics
"/>
Venus
<
emph.end
type
="
italics
"/>
and
<
lb
/>
<
emph
type
="
italics
"/>
Mercury,
<
emph.end
type
="
italics
"/>
revolve about it, inviſible in other times, by reaſon of their
<
lb
/>
ſmall digreſſions, leſſe than that of
<
emph
type
="
italics
"/>
Mercury,
<
emph.end
type
="
italics
"/>
and only viſible when
<
lb
/>
they interpoſe between the Sun and our eye, or elſe hint the truth
<
lb
/>
of both this and that; the certainty of which things ought not to be
<
lb
/>
contemned, nor omitted.</
s
>
</
p
>
<
p
type
="
margin
">
<
s
>
<
margin.target
id
="
marg1394
"/>
The Authors
<
lb
/>
Obſervations of
<
lb
/>
the Solar Spots.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>
<
emph
type
="
italics
"/>
Continuall obſervation hath at laſt aſſured me that theſe Spots are
<
lb
/>
matters contiguous to the Body of the Sun, there continually produced
<
lb
/>
in great number, and afterwards diſſolved, ſome in a ſhorter, ſome in a
<
lb
/>
longer time, and to be by the Converſion or Revolution of the Sun in it
<
lb
/>
ſelfe, which in a Lunar Moneth, or thereabouts, finiſheth its Period,
<
lb
/>
caried about in a Circle, an accident great of it ſelfe, and greater for
<
lb
/>
its Conſequences.
<
emph.end
type
="
italics
"/>
<
lb
/>
<
arrow.to.target
n
="
marg1395
"/>
</
s
>
</
p
>
<
p
type
="
margin
">
<
s
>
<
margin.target
id
="
marg1395
"/>
The occaſion
<
lb
/>
ducing the
<
lb
/>
thor to write
<
lb
/>
this Treatiſe.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>As to the other particular in the next place. ^{*} Many cauſes have
<
lb
/>
moved me to write the preſent Tract, the ſubject whereof, is the
<
lb
/>
Diſpute which I held ſome dayes ſince, with ſome learned men of
<
lb
/>
this City, about which, as your Highneſſe knows, have followed
<
lb
/>
many Diſcourſes: The principall of which Cauſes hath been the
<
lb
/>
Intimation of your Highneſſe, having commended to me Writing,
<
lb
/>
as a ſingular means to make true known from falſe, reall from
<
lb
/>
rent Reaſons, farr better than by Diſputing vocally, where the
<
lb
/>
one or the other, or very often both the Diſputants, through too </
s
>
</
p
>
</
chap
>
</
body
>
</
text
>
</
archimedes
>