Salusbury, Thomas, Mathematical collections and translations (Tome I), 1667
page |< < of 701 > >|
1be equal, the alterations of the annual Period would fail.
Three wayes of
altering the
portion of the
ditions of the
nal Revolution to
the annual motion.
That which
us is hard to be
derſtood, is with
Nature eaſie to be
effected.
If the Diurnal
motion ſhould not
alter, the annual
Period would ceaſe
SAGR. It ſeems then, that the Monethly alteration of
bings and flowings dependeth on the alteration of the annual
motion of the Earth?
And the annual alteration of thoſe
bings and flowings do, it ſeems, depend on the additions and
ſubſtractions of the diurnal converſion?
And here now I finde
my ſelf worſe puzzled than before, and more out of hope of
being able to comprehend how this intricacy may be, which is
more inextricable, in my judgment, than the Gordian knot.
And
I envy Simplicius, from whoſe ſilence I argue that he doth
prehend the whole buſineſſe, and is acquit of that confuſion
which greatly puzzleth my brains.
SIMP. I believe verily, Sagredus, that you are put to a
a ſtand; and I believe that I know alſo the cauſe of your
fuſion, which, if I miſtake not, riſeth from your underſtanding
part of thoſe particulars but even now alledged by Salviatus,
and but a part.
It is true likewiſe that I find my ſelf free from the
like confuſion; but not for that cauſe as you think, to wit,
cauſe I apprehend the whole, nay it happens upon the quite
contrary account; namely, from my not comprehending any
thing; and confuſion is in the plurality of things, and not in
nothing.
SAGR. You ſee Salviatus, how a few checks given to
cius in the dayes preceding, have rendered him gentle, and
brought him from the capriol to the amble. But I beſeech you
without farther delay, put us both out of ſuſpence.
SALV. I will endeavour it to the utmoſt of my harſh way of
expreſſing my ſelf, the obtuſeneſſe of which, the acuteneſſe of
your wit ſhall ſupply.
The accidents of which we are to enquire
the cauſes are two: The firſt reſpecteth the varieties that happen
in the ebbings and flowings in the Monethly Period; and the
thr relateth to the Annual.
We will firſt ſpeak of the
ly, and then treat of the Annual; and it is convenient that we
reſolve them all according to the Fundamentals and Hypotheſis
already laid down, without introducing any novelty either in
ſtronomy, or in the Univerſe, in favour of the ebbings and
ings; therefore let us demonſtrate that of all the ſeveral
dents in them obſerved, the cauſes reſide in the things already

known, and received for true and undoubted.
I ſay therefore,
that it is a truly natural, yea neceſſary thing, that one and the ſame
moveable made to move round by the ſame moving virtue in a
longer time, do make its courſe by a greater circle, rather than
by a leſſer; and this is a truth received by all, and
firmed by all experiments, of which we will produce a few.

In the wheel-clocks, and particularly in the great ones, to

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