Galilei, Galileo
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The systems of the world
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1661
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bed in the plain of the Ecliptick, and this we will divide into
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four equal parts with the two diameters
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Capricorn Cancer,
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and
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Libra Aries,
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which, at the ſame time, ſhall repreſent unto us the
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four Cardinal points, that is, the two Solſtices, and the two
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quinoctials; and in the centre of that circle we will place the
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Sun O, fixed and immoveable.</
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A plain Scheme
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repreſenting the
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Copernican
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theſis, and its
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ſequences.
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>Let us next draw about the four points, Capricorn, Cancer,
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Libra and Aries, as centres, four equal circles, which repreſent
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unto us the Earth placed in them at four ſeveral times of the
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year. </
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>The which, with its centre, in the ſpace of a year, paſſeth
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through the whole circumference, Capricorn, Aries, Cancer,
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bra, moving from Eaſt to Weſt, that is, according to the order
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of the Signes. </
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>It is already manifeſt, that whilſt the Earth is in
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Capricorn, the Sun will appear in Cancer, and the Earth moving
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along the arch Capricorn Aries, the Sun will ſeem to move along
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the arch Cancer Libra, and in ſhort, will run thorow the Zodiack
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according to the order of the Signes, in the ſpace of a year; and
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by this firſt aſſumption, without all queſtion, full ſatisfaction is
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given for the Suns apparent annual motion under the Ecliptick.
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>Now, coming to the other, that is, the diurnal motion of the
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Earth in it ſelf, it is neceſſary to eſtabliſh its Poles and its Axis,
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the which muſt be underſtood not to be erect perpendicularly
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upon the plain of the Ecliptick, that is, not to be parallel to the
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Axis of the grand Orb, but declining from a right angle 23
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grees and an half, or thereabouts, with its North Pole towards </
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