Stories of the Great Astronomers: Conversations with a Child

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D. Appleton, 1900 - 265 páginas
 

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Página 113 - Moreover, the satellites are invisible to the naked eye, and therefore can have no influence on the earth, and therefore would be useless, and therefore do not exist.
Página 78 - ... the squares of the periodic times of the planets are proportional to the cubes of their mean distances from the sun.

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