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

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1the right line B B P. Next ſuppoſe the Earth to be moved from
B to C, and Jupiter from B to C, in the ſame time; Iupiter
ſhall appear to have paſſed in the Zodiack to Q, and to have
moved ſtraight forwards, according to the order of the ſignes
P que In the next place, the Earth paſſing to D, and Iupiter
to D, it ſhall be ſeen in the Zodiack in R, and from E,
ter being come to E; will appear in the Zodiack in S, having
all this while moved right forwards.
But the Earth afterwards
beginning to interpoſe more directly between Iupiter and the
Sun, ſhe being come to F, and Iupiter to F, he will appear in
T, to have already begun to return apparently back again
der the Zodiack, and in that time that the Earth ſhall have
ed the arch E F, Iupiter ſhall have entertained himſelf between
the points S T, and ſhall have appeared to us almoſt
leſſe and ſtationary.
The Earth being afterwards come to G,
and Iupiter to G, in oppoſition to the Sun, it ſhall be viſible in
the Zodiack at V, and much returned backwards by all the arch
of the Zodiack T V; howbeit that all the way purſuing its even
courſe it hath really gone forwards not onely in its own circle,
but in the Zodiack alſo in reſpect to the centre of the ſaid
ack, and to the Sun placed in the ſame.
The Earth and Iupiter
again continuing their motions, when the Earth is come to H,
and Iupiter to H, it ſhall ſeem very much gone backward in the
Zodiack by all the arch V X.
The Earth being come to I, and
Iupiter to I, it ſhall be apparently moved in the Zodiack by the
tle ſpace X Y, and there it will ſeem ſtationary.
When
wards the Earth ſhall be come to K, and Iupiter to K; in the
Zodiack he ſhall have paſſed the arch Y N in a direct motion;
and the Earth purſuing its courſe to L, ſhall ſee Iupiter in L, in
the point Z.
And laſtly Iupiter in M ſhall be ſeen from the Earth
M, to have paſſed to A, with a motion ſtill right forwards; and
its whole apparent retrogadation in the Zodiack ſhall anſwer to
the arch S Y, made by Iupiter, whilſt that he in his own circle
paſſeth the arch E I, and the Earth in hers the arch E I.
And

this which hath been ſaid, is intended of Saturn and of Mars
alſo; and in Saturn thoſe retrogradations are ſomewhat more
frequent than in Jupiter, by reaſon that its motion is a little
ſlower than that of Jupiter, ſo that the Earth overtaketh it
it in a ſhorter ſpace of time; in Mars again they are more
rare, for that its motion is more ſwift than that of Jupiter.
Whereupon the Earth conſumeth more time in recovering it.
Next
as to Venus and Mercury, whoſe Circles are comprehended by that

of the Earth, their ſtations and regreſſions appear to be
oned, not by their motions that really are ſuch, but by the anual
motion of the ſaid Earth, as Copernicus exellently demonſtrateth,

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