Stories of the Great Astronomers: Conversations with a Child

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