## Kosmos: A Course of Six Lectures on the Development of Our Insight Into the Structure of the Universe |

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### Contents

Aims and Methods of Scientific | 3 |

Birth of Modern Astronomy Kepler Galileo New | 19 |

The Beginning of Sidereal Astronomy William Her | 34 |

Copyright | |

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### Common terms and phrases

absolute magnitude apparent magnitude Archimedes Aristarchus astronomical units astronomy atomic called centre century clouds considered Copernican system Copernicus course curvature decrease density law derived determination diagram diameter direction discovery distribution earth entirely epoch equations evolution excentric circles expanding universe expansion explained fact field-equations finite density fixed stars fundamental galactic plane galactic system Galileo give globular clusters Greek Hipparchus Huygens hypotheses ideas inertia investigations John Herschel Kapteyn system Kapteyn units Kepler lightyears lines luminosity mathematical matter mean parallax measure mechanics method milky million Mount Wilson nature neighbourhood Newton's nitudes number of stars Observatory orbit parallax parsecs perpendicular phenomena physical planetary nebulae position possible problem proper motion Ptolemy radial velocities radius remarkable scale Shapley's shell solution sphere spiral nebulae star streams static universe stellar system structure Struve surface system of excentric tance telescope theory of relativity tion Tycho whole William Herschel zero