Galilei, Galileo - The systems of the world

Galilei, Galileo, The systems of the world, 1661

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dayes, or thereabouts, the ſole annual motion of the Earth be
tween Mars and Venus, cauſeth the apparent inequalities in all

the five ſtars before named. And for a facile and full under
ſtanding of the whole, I will deſcribe this figure of it. There
fore ſuppoſe the Sun to be placed in the centre O, about which
we will draw the Orb deſcribed by the Earth, with the an
nual motion B G M, and let the circle deſcribed, v. gr. by
Jupiter about the Sun in 12. years, be this BGM, and in the

[Figure 19]

ſtarry ſphere let us imagine the Zodiack Y V S. Again, in the
annual Orb of the Earth let us take certain equal arches, B C,
C D, E F, F G, G H, H I, I K, K L, L M, and in the Sphere
of Jupiter let us make certain other arches, paſſed in the ſame
times in which the Earth paſſeth hers, which let be B C, C D,
D E, E F, F G, G H, H I, I K, K L, L M, which ſhall each be
proportionally leſſe than theſe marked in the Earths Orb, like
as the motion of Jupiter under the Zodiack is ſlower than the
annual. Suppoſing now, that when the Earth is in B, Jupiter is
in B, it ſhall appear to us in the Zodiack to be in P, deſcribing

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