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On Some Points in the Early History of Astronomy1

Naturevolume 44pages107110 (1891) | Download Citation



IV FROM what has been stated it is not too much to assume that the Egyptians observed the sun on the horizon. This being so, the chances are that at first they would observe the stars on the horizon too, both stars rising and stars setting; and that is rendered more probable by the very careful way in which early astronomers defined the various conditions under which a star can rise or set, always, be it well remembered, in relation to the sun. They spoke of a star as rising or setting achronically, heliacally, or cosmically.


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