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on the revolutions of the heavenly spheres pdf

Escrito por em 17/10/2020


But it is not perceived straightway to be a perfect sphere, on account of the great height of its mountains and the lowness of its valleys though they modify its universal roundness to only a very small extent. In this way Cynosura [the pole star] is seen to move much more slowly than Aquila or Canicula because, being very near to the pole, it describes a smaller circle, since they are all on a single sphere, the movement of which stops at its axis and which does not allow any of its parts to have movements which are equal to one another. And if you add to these the islands discovered in our time under the princes of Spain and Portugal and especially America--named after the ship's captain who discovered her--which they consider a second orbis terrarum on account of her so far unmeasured magnitude--besides many other islands heretofore unknown, we would not be greatly surprised if there were antiphodes or antichthones. Or have the heavens become so immense, because an unspeakably vehement motion has pulled them away from the centre, and because the heavens would fall if they came to rest anywhere else? For this movement which would traverse the total circuit of the Earth in twenty-four hours would necessarily be very headlong and of an unsurpassable velocity. And we should be even more surprised if such a vast world should wheel completely around during the space of twenty-four hours rather than that its least part, the Earth, should. And we would see clouds and other things floating in the air always borne toward the west. So this same problem concerning the daily revolution comes up again. And in accordance with the axiom of physics that that which is infinite cannot be traversed or moved in any way, then the heavens will necessarily come to rest. And in accordance with the axiom of physics that that which is infinite cannot be traversed or moved in any way, then the heavens will necessarily come to rest. 9. So Aristotle. Now with a dioptra or horoscope or level placed at E, the beginning of Cancer is seen to rise at point C; and at the same moment the beginning of Capricorn appearsto set at A. For not many years ago under Leo X when the Lateran Council was considering the question of reforming the Ecclesiastical Calendar, no decision was reached, for the sole reason that the magnitude of the year and the months and the movements of the sun and moon had not yet been measured with sufficient accuracy. For my own works do not please me so much that I do not weigh what judgements others will pronounce concerning them. And those which fall downward possess a slow movement at the beginning but increase their velocity as they fall. Then what would we say about the clouds and the other things floating in the air or falling or rising up, except that not only the Earth and the watery element with which it is conjoined are moved in this way but also no small part of the air and whatever other things have a similar kinship with the Earth? So this same problem concerning the daily revolution comes up again. And we perceive the five wandering stars sometimes even to retrograde and to come to a stop between these two movements. And a long time ago, he says, the scattered Earth would have passed beyond the heavens, as is certainly ridiculous; and a fortiori so would all the living creatures and all the other separate masses which could by no means remain unshaken.

7. And we would see clouds and other things floating in the air always borne toward the west. So if the worth of the arts were measured by the matter with which they deal, this art--which some call astronomy, others astrology, and many of the ancients the consummation of mathematics--would be by far the most outstanding. So it is as regards the place of the earth; for although It is not at the centre of the world, nevertheless the distance is as nothing, particularly in comparison with the sphere of the fixed stars. 9. We can say that that part of the air is deprived of terrestrial motion on account of its great distance from the Earth. And things are as when Aeneas said in Virgil: "We sail out of the harbor, and the land and the cities move away." Conversely, it is no less astonishing for them to say that the highest region of the air follows the celestial movement, as is shown by those stars which appear suddenly--I mean those called "comets" or "bearded stars" by the Greeks. And in accordance with the axiom of physics that that which is infinite cannot be traversed or moved in any way, then the heavens will necessarily come to rest. As regards things which move downward on account of their weight because they have very much earth in them, doubtless their parts possess the same nature as the whole, and it is for the same reason that fiery bodies are drawn upward with force.

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