Popular Astronomy...Harper, 1880 - 571 síđur |
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Common terms and phrases
angle appear astronomers atmosphere attraction axis bodies bright called carried cause celestial sphere centre century circle comet complete consequence continuous corresponding course dark described determined diameter direction disk distance earth eclipse effect entirely equal equator fact fall figure force four give glass greater half heat heavens horizon inches increase Jupiter known latter length less light lines look Mars mass mean measuring meridian method miles minutes mirror months moon motion move nearly necessary night object observations occur opposite orbit owing parallax pass period planet pole position present probably produced question rays reach reflected represented result revolving rise rotation round satellites seems seen shown side solar spectrum star sun's supposed surface telescope theory tion transit turn Venus visible whole