The Story of the Heavens |
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61 Cygni actually appearance astronomers atmosphere attraction axis beautiful bodies bright brilliant calculations celestial centre chapter circle comet compared constellation course crater diameter dimensions discovery distance Double Star doubt earth ellipse equal fact globe gradually heat heavens Herschel instrument interest Jupiter Kepler known labours law of gravitation laws of Kepler length less light lunar magnitude Mars mass measure Mercury meteorites meteors mighty miles a second minor planets minute moon motion move movements nearly nebula Neptune night object observations observatory once orbit parallax pass path period phenomena planetary Pole Star position present proper motion question rays remarkable revolution revolve ring rotation round satellites Saturn seems seen shooting stars shower shown Sirius solar system spot stupendous sun's suppose surface tail telescope theory tides tion transit of Venus unaided eye Uranus vast velocity visible volcanoes weight