Salusbury, Thomas, Mathematical collections and translations (Tome I), 1667

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              <s>
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              that I fear I ſhall have but a ſmall part of it left free and
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              gaged, to apply to the principal matter that is treated of, and
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              which of it ſelf is but even too obſcure and intricate: So that
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              I intreat you to vouchſafe me, having once diſpatcht the buſineſs
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              of the ebbings and flowings, to do this honour to my houſe (and
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              yours) ſome other dayes, and to diſcourſe upon the ſo many other
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              Problems that we have left in ſuſpence; and which perhaps are
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              no leſs curious and admirable, than this that hath been diſcuſſed
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              theſe dayes paſt, and that now ought to draw to a
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              cluſion.</s>
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              <s>SALV. </s>
              <s>I ſhall be ready to ſerve you, but we muſt make more
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              than one or two Seſſions; if beſides the other queſtions reſerved
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              to be handled apart, we would diſcuſſe thoſe many that pertain
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              to the local motion, as well of natural moveables, as of the
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              ed: an Argument largely treated of by our
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              Lyncean
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              mick.
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              But turning to our firſt purpoſe, where we were about to
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              declare, That the bodies moving circularly by a movent virtue,
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              which continually remaineth the ſame, the times of the
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              tions were prefixt and determined, and impoſſible to be made
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              longer or ſhorter, having given examples, and produced
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              ments thereof, ſenſible, and feaſible, we may confirm the ſame
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              truth by the experiences of the Celeſtial motions of the Planets;
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              in which we ſee the ſame rule obſerved; for thoſe that move by
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              greater Circles, confirm longer times in paſſing them. </s>
              <s>A moſt
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              pertinent obſervation of this we have from the
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              Medicæan
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              nets, which in ſhort times make their revolutions about
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              Jupiter
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              :
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              Inſomuch that it is not to be queſtioned, nay we may hold it for
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              ſure and certain, that if for example, the Moon continuing to be
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              moved by the ſame movent faculty, ſhould retire by little and
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              little in leſſer Circles, it would acquire a power of abreviating
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              the times of its Periods, according to that
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              Pendulum,
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              of which in
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              the courſe of its vibrations, we by degrees ſhortned the cord, that
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              is contracted the Semidiameter of the circumferences by it paſſed.
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              </s>
              <s>Know now that this that I have alledged an example of it in the
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              Moon, is ſeen and verified eſſentially in fact. </s>
              <s>Let us call to mind,
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              that it hath been already concluded by us, together with
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              Coperni-
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                <arrow.to.target n="marg806"/>
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                <emph type="italics"/>
              cus,
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              That it is not poſſible to ſeparate the Moon from the Earth,
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              about which it without diſpute revolveth in a Moneth: Let us
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              remember alſo that the Terreſtrial Globe, accompanyed alwayes
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              by the Moon, goeth along the circumference of the Grand Orb
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              about the Sun in a year, in which time the Moon revolveth about
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              the Earth almoſt thirteen times; from which revolution it
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              eth, that the ſaid Moon ſometimes is found near the Sun; that is,
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              when it is between the Sun and the Earth, and ſometimes
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              much more remote, that is, when the Earth is ſituate between </s>
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