Salusbury, Thomas, Mathematical collections and translations (Tome I), 1667
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              <s>
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              we may aſſure our ſelves, I ſay, that bodies ſhining with moſt|
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              ly light do irradiate, or beam forth rayes more by far than thoſe
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              that are of a more languiſhing light. </s>
              <s>I have many times ſeen
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              piter
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              and
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              Venus
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              together twenty or thirty degrees diſtant from the
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              Sun, and the air being very dark,
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              Venus
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              appeared eight or ten
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              times bigger than
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              Jupiter,
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              being both beheld by the eye at
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              ty; but being beheld afterwards with the Teleſcope, the
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              Diſcus
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              of
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              Jupiter
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              diſcovered it ſelf to be four or more times greater than
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              that of
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              Venus,
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              but the vivacity of the ſplendour of
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              Venus
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              was
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              comparably bigger than the languiſhing light of
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              Jupiter
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              ; which
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              was only becauſe of
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              Jupiters
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              being far from the Sun, and from us;
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              and
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              Venus
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              neer to us, and to the Sun. </s>
              <s>Theſe things premiſed, it
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              will not be difficult to comprehend, how Mars, when it is in
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              ſition to the Sun, and therefore neerer to the Earth by ſeven times,
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              and more, than it is towards the conjunction, cometh to appear
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              ſcarce four or five times bigger in that ſtate than in this, when as it
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              ſhould appear more than fifty times ſo much; of which the only
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              irradiation is the cauſe; for if we diveſt it of the adventitious
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              rayes, we ſhall find it exactly augmented with the due proportion:
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              but to take away the capillitious border, the Teleſcope is the beſt
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              and only means, which inlarging its
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              Diſcus
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              nine hundred or a
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              thouſand times, makes it to be ſeen naked and terminate, as that
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              of the Moon, and different from it ſelf in the two poſitions,
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              cording to its due proportions to an hair. </s>
              <s>Again, as to
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              Venus,
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              that in its veſpertine conjunction, when it is below the Sun, ought
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              to ſhew almoſt fourty times bigger than in the other matutine
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              junction, and yet doth not appear ſo much as doubled; it
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              eth, beſides the effect of the irradiation, that it is horned; and its
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              creſcents, beſides that they are ſharp, they do receive the Suns light
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              obliquely, and therefore emit but a faint ſplendour; ſo that as
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              being little and weak, its irradiation becometh the leſſe ample
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              and vivacious, than when it appeareth to us with its Hemiſphere all
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              ſhining: but now the Teleſcope manifeſtly ſhews its hornes to
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              have been as terminate and diſtinct as thoſe of the Moon, and
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              appear, as it were, with a great circle, and in a proportion thoſe
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              well neer fourty times greater than its ſame
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              Diſcus,
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              at ſuch time
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              as it is ſuperiour to the Sun in its ultimate matutine apparition.</s>
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              An eaſie
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              riment that
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              eth the increaſe in
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              the ſtars, by means
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              of the adventitious
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              rays.
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              </s>
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              <s>
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              Jupiter
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              augments
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              leſſe than the
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              ſtar.</s>
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              <s>
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              The
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              Sun
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              and
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              Moon
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              increaſe
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              tle.
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              </s>
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              It is ſeen by
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              nifeſt experience,
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              that the more
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              ſplendid bodies do
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              much more
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              ate than the leſſe
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              lucid.
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              </s>
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              <s>
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              The
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              Teleſcope
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              is the beſt means to
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              take away the
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              radiations of the
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              Stars.
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              </s>
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              <s>
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              Another ſecond
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              reaſon of the ſmall
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              apparent increaſe
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              of
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              Venus.</s>
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              <s>SAGR. Oh,
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              Nicholas Copernicus,
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              how great would have been
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              thy joy to have ſeen this part of thy Syſteme, confirmed with ſo
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              manifeſt
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              </s>
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              <s>
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              Copernicus
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              ſwaded by reaſons
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              contrary to ſenſible
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              experiments.
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              <s>SALV. </s>
              <s>Tis true. </s>
              <s>But how much leſſe the fame of his ſublime
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              wit amongſt the intelligent? </s>
              <s>when as it is ſeen, as I alſo ſaid before,
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              that he did conſtantly continue to affirm (being perſwaded thereto
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              by reaſon) that which ſenſible experiments ſeemed to contradict;
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              for I cannot ceaſe to wonder that he ſhould conſtantly perſiſt in
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              ſaying, that
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              Venus
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              revolveth about the Sun, and is more than ſix </s>
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