Galilei, Galileo
,
The systems of the world
,
1661
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darkneſſe; for that that matter which admits the paſſage of the
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Suns rayes thorow a ſpace of two thouſand miles, muſt needs be
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ſo tranſparent, that it would very weakly reſiſt them in a
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dredth, or leſſer part of that thickneſſe; nevertheleſſe, the term
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which ſeparateth the part illuminated from the obſcure, is
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dent, and as diſtinct, as white is diſtinct from black; and
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ſpecially where the Section paſſeth through the part of the Moon,
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that is naturally more clear and montanous; but where the old
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ſpots do part, which are certain plains, that by means of their
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ſpherical inclination, receive the rayes of the Sun obliquely,
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there the term is not ſo diſtinct, by reaſon of the more dimme
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lumination. </
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>That, laſtly, which he ſaith, how that the ſecondary
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light doth not diminiſh and languiſh, according as the Moon
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creaſeth, but conſerveth it ſelf continually in the ſame efficacy;
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is moſt falſe; nay it is hardly ſeen in the quadrature, when, on
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the contrary, it ſhould appear more ſplendid, and be viſible after
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the
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crepuſculum
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in the dark of night. </
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<
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>Let us conclude therefore,
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that the Earths reflection is very ſtrong upon the Moon; and that,
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which you ought more to eſteem, we may deduce from thence
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other admirable congruity between the Moon and Earth;
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ly, that if it be true, the Planets operate upon the Earth by their
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motion and light, the Earth may probably be no leſſe potent in
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operating reciprocally upon them with the ſame light, and
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venture, motion alſo. </
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<
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>And though it ſhould not move, yet may
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it retain the ſame operation; becauſe, as it hath been proved
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ready, the action of the light is the ſelf ſame, I mean of the light
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of the Sun reflected; and motion doth nothing, ſave only vary
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the aſpects, which fall out in the ſame manner, whether we make
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the Earth move, and the Sun ſtand ſtill, or the contrary.</
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The Earth may
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ciprocally operate
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upon Cœleſtial
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dies, with its light.
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<
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>SIMPL. </
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<
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>None of the Philoſophers are found to have ſaid, that
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theſe inferiour bodies operate on the Cœleſtial, nay,
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Ariſtotle
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firmes the direct contrary.</
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<
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>SALV.
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Aristotle
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and the reſt, who knew not that the Earth and
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Moon mutually illuminated each other, are to be excuſed; but
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they would juſtly deſerve our cenſure, if whileſt they deſire that
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we ſhould grant and believe with them, that the Moon operateth
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upon the Earth with light, they ſhould deny to us, who have
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taught them that the Earth illuminates the Moon, the operation
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the Earth hath on the Moon.</
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<
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>SIMPL. </
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<
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>In ſhort, I find in my ſelf a great unwillingneſſe to
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admit this commerce, which you would perſwade me to be
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twixt the Earth and Moon, placing it, as we ſay, amongſt the
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number of the Stars; for if there were nothing elſe, the great
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ſeparation and diſtance between it and the Cœleſtial bodies, doth
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in my opinion neceſſarily conclude a vaſt diſparity between them.</
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