Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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and diſtant from it a yard or thereabouts. </
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<
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>This being placed, I
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will ſeek in the Plain the place from whence one of the ſtars of
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Charls's
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Waine, in paſſing by the Meridian, cometh to hide it
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ſelf behind the beam ſo placed, or in caſe the beam ſhould not
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be ſo big as to hide the ſtar, I will finde a ſtation where one
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may ſee the ſaid beam to cut the ſaid ſtar into two equal parts;
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an effect that with an ^{*} exquiſite Teleſcope may be perfectly
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diſcerned. </
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>And if in the place where the ſaid accident is
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ed, there were ſome building, it will be the more commodious;
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but if not, I will cauſe a Pole to be ſtuck very faſt in the
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ground, with ſome ſtanding mark to direct where to place the
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eye anew, when ever I have a mind to repeat the obſervation.
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<
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>The firſt of which obſervations I will make about the Summer
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Solſtice, to continue afterwards from Moneth to Moneth, or
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when I ſhall ſo pleaſe, to the other Solſtice; with which
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vation one may diſcover the elevation and depreſſion of the ſtar,
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though it be very ſmall. </
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<
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>And if in that operation it ſhall
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pen, that any mutation ſhall diſcover it ſelf, what and how great
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benefit will it bring to Aſtronomy? </
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<
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>Seeing that thereby, beſides
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our being aſſured of the annual motion, we may come to know
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the grandure and diſtance of the ſame ſtar.</
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What
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ments are apt for
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moſt exact
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vation.
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* Italian braces.</
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An exquiſite
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obſervation of the
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approach and
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parture of the Sun
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from the Summer
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Solſtice.
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A place
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modated for the
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obſervation of the
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fixed ſtars, as to
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what concers the
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annual motion of
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the Earth.
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<
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>SAGR. </
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>I very well comprehend your whole proceedings;
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and the operation ſeems to me ſo eaſie, and ſo commodious for
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the purpoſe, that it may very rationally be thought, that either
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Copernicus
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himſelf, or ſome other Aſtronomer had made trial
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of it.</
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<
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>SALV. </
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>But I judg the quite contrary, for it is not probable,
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that if any one had experimented it, he would not have
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tioned the event, whether it fell out in favour of this, or that
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opinion; beſides that, no man that I can find, either for this,
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or any other end, did ever go about to make ſuch an
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on; which alſo without an exact Teleſcope could but badly be
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effected.</
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>SIMP. </
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>I am fully ſatisfied with what you ſay. </
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>But ſeeing
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that it is a great while to night, if you defire that I ſhall paſſe
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the ſame quietly, let it not be a trouble to you to explain unto
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us thoſe Problems, the declaration whereof you did even now
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requeſt might be deferred until too morrow. </
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<
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>Be pleaſed to grant
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us your promiſed indulgence, and, laying aſide all other
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ſes, proceed to ſhew us, that the motions which
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Copernicus
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aſſigns
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to the Earth being taken for granted, and ſuppoſing the Sun
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and fixed ſtars immoveable, there may follow the ſame
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dents touching the elevations and depreſſions of the Sun,
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ing the mutations of the Seaſons, and the inequality of dayes
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and nights,
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&c.
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in the ſelf ſame manner, juſt as they are with </
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