Galilei, Galileo
,
The systems of the world
,
1661
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our parts muſt needs be very obſervable; certain ſpots and other
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notable things in thoſe parts, being one while diſcernable, and
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another while not. </
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>A like variation may alſo be obſerved towards
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the North and South extremities of the ſame
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Diſcus
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(or Surface)
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according as the Moons poſition is in one or the other Section of
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its Dragon; For, if it be North, ſome of its parts towards the
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North are hid, and ſome of thoſe parts towards the South are
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diſcovered, and ſo on the contrary. </
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<
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>Now that theſe
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ces are really true, is verified by the
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Teleſcope,
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for there be in
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the Moon two remarkable ſpots, one of which, when the Moon
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is in the meridian, is ſituate to the Northweſt, and the other is
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almoſt diametrically oppoſite unto it; and the firſt of theſe is
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ſible even without the
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Teleſcope
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; but the other is not. </
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<
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wards the Northweſt is a reaſonable great ſpot of oval figure,
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parated from the other great ones; the oppoſite one is leſſe, and
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alſo ſevered from the biggeſt, and ſituate in a very cleer field; in
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both theſe we may manifeſtly diſcern the foreſaid variations, and
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ſee them one after another; now neer the edge or limb of the
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Lunar
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Diſcus,
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and anon remote, with ſo great difference that
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the diſtance betwixt the Northweſt and the circumference of the
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Diſcus
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is more than twice as great at one time, as at the other;
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and as to the ſecond ſpot (becauſe it is neerer to the
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rence) ſuch mutation importeth more, than twice ſo much in the
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former. </
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<
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>Hence its manifeſt, that the Moon, as if it were drawn
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by a magnetick vertue, conſtantly beholds the Terreſtrial Globe
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with one and the ſame aſpect, never deviating from the ſame.</
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All the Earth
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ſeeth half onely of
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the Moon, & the
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half onely of the
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Moon ſeeth all the
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Earth.
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From the Earth
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we ſee more than
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half the Lunar
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Globe.
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Two ſpots in the
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Moon, by which it
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is perceived that
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ſhe hath respect to
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the centre of the
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Earth in her
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tion.
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<
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>SAGR. Oh! when will there be an end put to the new
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ſervations aud diſcoveries of this admirable Inſtrument?</
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<
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>SALV. </
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>If this ſucceed according to the progreſſe of other great
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inventions, it is to be hoped, that in proceſſe of time, one may
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arrive to the ſight of things, to us at preſent not to be imagined.
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But returning to our firſt diſcourſe, I ſay for the ſixth reſemblance
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betwixt the Moon and Earth, that as the Moon for a great part
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of time, ſupplies the want of the Suns light, and makes the
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nights, by the reflection of its own, reaſonable clear; ſo the
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Earth, in recompence, affordeth it when it ſtands in moſt need,
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by reflecting the Solar rayes, a very cleer illumination, and ſo
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much, in my opinion, greater than that which cometh from her to
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us, by how much the ſuperficies of the Earth is greater than that
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of the Moon.</
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Sixthly, The
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Earth and Moon
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interchangeably do
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illuminate.
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<
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>SAGR. </
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<
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>Hold there,
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Salviatus
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hold there, and permit me the
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pleaſure of relating to you, how at this firſt hint I have penetrated
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the cauſe of an accident, which I have a thouſand times thought
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upon, but could never find out. </
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<
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>You would ſay, that the
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fect light which is ſeen in the Moon, eſpecially when it is horned, </
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