Word: heliocentricism
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The first conception of the universe was a geocentric one, and in the sixteenth century Copernicus made the first great step in astronomical research by overturning this old theory in favor of a heliocentric one which held that the earth and the planets went around the sun. In 1902, a...
"Copernicus and the Heliocentric Theory," Professor Stetson, Astronomical Laboratory.
"At present," concluded Professor Stetson, "the theory satisfactorily accounts for the irregular processional motion of the orbit of Mercury, and for the displacement of starlight passing through the sun's magnetic field on its way to the earth. If the Einstein theory of relativity is conclusively established, as no doubt...
One of the greatest problems that confronts astronomers at the present time is an accurate knowledge of the distances of stars. From the earliest times, the relative positions of stars or their apparent directions in space have been observed and measured with increasing accuracy. Before anything definite could be learned...