Letters on Astronomy: Addressed to a Lady; in which the Elements of the Science are Familiarly Explained in Connexion with Its Literary History
Marsh, Capen, Lyon and Webb, 1841 - 419 strani
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angle appear astronomers atmosphere attraction axis body bright called causes celestial centre changes circle comet consequently continually course determined diameter direction distance earth east ecliptic effect equal equator fact fall figure fixed force four Galileo give given gravity greater greatest half heavenly heavens Hence horizon hundred increase Jupiter known laws length less LETTER light magnitude matter means measure meridian meteors miles minutes moon motion move namely Nature nearer nearly objects observations opposite orbit passing period planets pole portion position present produced reach reason represent respect revolve ring round satellites seen shadow side situated solar sometimes space sphere stars supposed surface telescope things thousand tides tion truth turned universal various Venus whole