By Galileo Galilei
Read Online or Download Dialogue Concerning the Two Chief World Systems (1632) - Translated by Drake - Abridged by S. E. Sciortino PDF
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Additional info for Dialogue Concerning the Two Chief World Systems (1632) - Translated by Drake - Abridged by S. E. Sciortino
Example text
Simplicio, present them, if you will; or, if you want me to relieve you of that burden, I am at your service. SIMP. It will be better for you to bring them up, for having given them greater study you will have them readier at hand, and in great number too.... SALV. But is it not your opinion, and that of the author and of Aristotle and Ptolemy and all their followers, that earth, water, and air are equally of such a nature as to be constituted immovable about the center? SIMP. That is taken as an irrefutable truth.
Because if it were, it would belong also to all its particles. But every one of them is moved along a straight line toward the center. Being thus forced and preternatural, it cannot be everlasting. But the world order is eternal; therefore, etc. "Second, it appears that all other bodies which move circularly lag behind, and are moved with more than one motion, except the primum mohile. Hence it would be necessary that the earth be moved also with two motions; and if that were so, there would have to be variations in the fixed stars.
Aristotle answers all these questions for you. He tells you that just as there is only one motion for one movable body, so there is but one movable body for that motion. Consequently no motion can either exist or even be imagined except as inhering In its subject. SAGR. Now in the third place I should like you to tell me whether you believe that the moon and the other planets and celestial bodies have their own motions, and what these are. SIMP. They have, and they are those motions in accordance with which they run through the zodiac--the moon in a month, the sun in a year, Mars in two, the stellar sphere in so many thousands.