Salusbury, Thomas, Mathematical collections and translations (Tome I), 1667

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1ſeperate from the Earth, for the reaſons that ſhall be more
ly alledged hereafter.
The mutation
of figure in Venus
argueth its motion
to be about the Sun.
The Moon
not ſeperate from
the Earth.
SAGR. I expect that I ſhall hear more admirable things that
depend upon this annual motion of the Earth, than were thoſe
dependant upon the diurnal
The annual
tion of the Earth
mixing with the
motions of the
ther Planets
duce extravagant
appearances.
SALV. You do not therein erre: For as to the operation of
the diurnal motion upon the Celeſtial bodies, it neither was, nor
can be other, than to make the Univerſe ſeem to run precipitately
the contrary way; but this annual motion intermixing with the
particular motions of all the planets, produceth very many
travagancies, which have diſarmed and non-pluſt all the greateſt
Scholars in the World.
But returning to our firſt general
henſions, I reply that the centre of the Celeſtial converſions of
the five planets Saturn, Jupiter, Mars, Venus and Mercury, is
the Sun; and ſhall be likewiſe the centre of the motion of the
Earth, if we do but ſucceed in our attempt of placing it in
ven.
And as for the Moon, this hath a circular motion about the
Earth, from which (as I ſaid before) it can by no means alienate
it ſelf, but yet doth it not ceaſe to go about the Sun together with
the Earth in an annual motion.
SIMP. I do not as yet very well apprehend this ſtructure, but
it may be, that with making a few draughts thereof, one may
ter and more eaſily diſcourſe concerning the ſame.
SALV. Tis very true: yea for your greater ſatisfaction and
miration together, I deſire you, that you would take the pains
to draw the ſame; and to ſee that although you think you do not
apprehend it, yet you very perfectly underſtand it; And onely
by anſwering to my interrogations you ſhall deſigne it punctually.

Take therefore a ſheet of paper and Compaſles; And let this
white paper be the immenſe expanſion of the Univerſe; in which
you are to diſtribute and diſpoſe its parts in order, according as
reaſon ſhall direct you.
And firſt, in regard that without my
ſtruction you verily believe that the Earth is placed in this
verſe, therefore note a point at pleaſure, about which you
tend it to to be placed, and mark it with ſome characters.
The Syſteme of
the Univerſe
ſigned from the
pearances.
SIMP. Let this mark A be the place of the Terreſtrial Globe.
SALV. Very well. I know ſecondly, that you underſtand
fectly that the ſaid Earth is not within the body of the Sun, nor
ſo much as contiguous to it, but diſtant for ſome ſpace from the
ſame, and therefore aſſign to the Sun what other place you beſt
like, as remote from the Earth as you pleaſe, and mark this in
like manner.
SIMP. Here it is done: Let the place of the Solar body
be O.
SALV. Theſe two being conſtituted, I deſire that we may

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