Salusbury, Thomas, Mathematical collections and translations (Tome I), 1667
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              <s>SALV. </s>
              <s>I am ready to ſerve you. </s>
              <s>You have already ſeen me
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              draw the form of the
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              Copernican
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              Syſteme; againſt the truth of
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              which
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              Mars
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              himſelf, in the firſt place, makes an hot charge; who, in
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              caſe it were true, that its diſtances from the earth ſhould ſo much
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              vary, as that from the leaſt diſtance to the greateſt, there were
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              twice as much difference, as from the earth to the Sun; it would be
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              neceſſary, that when it is neareſt unto us, its
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              diſcus
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              would ſhew
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              more than 60. times bigger than it ſeems, when it is fartheſt from
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              us; nevertheleſs that diverſity of apparent magnitude is not to be
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              ſeen, nay in its oppoſition with the Sun, when its neareſt to the
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              Earth, it doth not ſhew ſo much as quadruple and quintuple in
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              bigneſs, to what it is, when towards the conjunction it cometh to
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              be occulted under the Suns rayes. </s>
              <s>Another and greater difficulty
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              doth
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              Venus
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              exhibit; For if revolving about the Sun, as
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              Copernicus
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              affirmeth, it were one while above, & another while below the ſame,
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              receding and approaching to us ſo much as the Diameter of the
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              cle deſcribed would be, at ſuch time as it ſhould be below the Sun,
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              and neareſt to us, its
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              diſcus
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              would ſhew little leſs than 40 times
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              ger than when it is above the Sun, near to its other conjunction; yet
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              nevertheleſſe, the difference is almoſt imperceptible Let us add
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              other difficulty, that in caſe the body of
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              Venus
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              be of it ſelf dark, and
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              onely ſhineth as the Moon, by the illumination of the Sun, which
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              ſeemeth moſt reaſonable; it would ſhew forked or horned at ſuch
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              time as it is under the Sun, as the Moon doth when ſhe is in like
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              manner near the Sun; an accident that is not to be diſcovered in
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              her. </s>
              <s>Whereupon
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              Copernicus
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              affirmeth, that either ſhe is light of
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              her ſelf, or elſe that her ſubſtance is of ſuch a nature, that it can
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              imbue the Solar light, and tranſmit the ſame through all its whole
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              depth, ſo as to be able to appear to us alwayes ſhining; and in this
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              manner
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              Copernicus
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              excuſeth the not changing figure in
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              Venus
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              : but
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              of her ſmall variation of Magnitude, he maketh no mention at all;
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              and much leſs of
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              Mars
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              than was needful; I believe as being
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              ble ſo well as he deſired to ſalve a
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              Phænomenon
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              ſo contrary to his
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              Hypotheſis, and yet being convinced by ſo many other occurrences
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              and reaſons he maintained, and held the ſame Hypotheſis to be true.
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              </s>
              <s>Beſides theſe things, to make the Planets, together with the Earth,
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              to move above the Sun as the Centre of their converſions, and the
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              Moon onely to break that order, and to have a motion by it ſelf
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              about the earth; and to make both her, the Earth, and the whole
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              Elementary
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              Sphere,
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              to move all together about the Sun in a year,
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              this ſeemeth to pervert the order of this Syſteme, which rendreth
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              it unlikely and falſe. </s>
              <s>Theſe are thoſe difficulties that make me
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              wonder how
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              Aristarchus
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              and
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              Copernicus,
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              who muſt needs have
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              ſerved them, not having been able for all that to ſalve them, have
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              yet notwithſtanding by other admirable occurrences been induced </s>
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