Stories of the Great Astronomers: Conversations with a ChildD. Appleton, 1900 - 265 страници |
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61 Cygni ABCD Alexandria Alpha Lyra Aristotle astronomy attracts Bessel binary stars body born calculations called celestial century church circle colors comet Copernicus diameter died discovered discoveries distance double star earth moves ellipse equinox Europe explained eyepiece fall Galileo globe gravitation Greek heavens Hipparchus Huyghens invented John Herschel Jupiter Kepler Kepler's laws knew laws of Kepler learned lens lenses Lick Observatory look Mars mass mathematics measure miles Milky moon moon's motions moves round naked eye nebula Newton night object glass observations opera glass orbit ovals particle picture shows planets moved prism proved Ptolemy recollect reflecting telescope revolve round the sun satellites Saturn scientific seen seven shadow shining solar system solstice space suppose surface things thought tions true Tycho Brahe Tycho's universe unknown planet Uranus Venus vibrations whole
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Страница 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.
Страница 78 - ... the squares of the periodic times of the planets are proportional to the cubes of their mean distances from the sun.