History of Astronomy |
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Page 16
... fixed in the centre of the world . Nicetas , Heraclides , and Ecphantes supposed the earth to revolve on its axis , but to have no orbital motion . The short epitome so far given illustrates the extraordinary deductive methods adopted ...
... fixed in the centre of the world . Nicetas , Heraclides , and Ecphantes supposed the earth to revolve on its axis , but to have no orbital motion . The short epitome so far given illustrates the extraordinary deductive methods adopted ...
Page 17
... fixed the positions of the zodiacal stars , near to which all the planets in their orbits pass , thus facilitating the determination of planetary motions . Aristarchus ( 320-250 B.C. ) showed that THE GEOMETRICAL PERIOD 17.
... fixed the positions of the zodiacal stars , near to which all the planets in their orbits pass , thus facilitating the determination of planetary motions . Aristarchus ( 320-250 B.C. ) showed that THE GEOMETRICAL PERIOD 17.
Page 18
... fixed earth . He called this point the excentric . The line from the earth to the excentric " was called the line of apses . A circle having this centre was called the equant , and he supposed that a radius drawn to the sun from the ...
... fixed earth . He called this point the excentric . The line from the earth to the excentric " was called the line of apses . A circle having this centre was called the equant , and he supposed that a radius drawn to the sun from the ...
Page 19
... fixed stars . He then set to work to catalogue all the principal stars so as to know if any others appeared or disappeared . Here his experiences resembled those of several later astronomers , who , when in search of some special object ...
... fixed stars . He then set to work to catalogue all the principal stars so as to know if any others appeared or disappeared . Here his experiences resembled those of several later astronomers , who , when in search of some special object ...
Page 20
... fix dates in history by the effects of precession of the equinoxes . ( 1 ) At about the date when the Great Pyramid may have been built y Draconis was near to the pole , and must have been used as the pole - star . In the north face of ...
... fix dates in history by the effects of precession of the equinoxes . ( 1 ) At about the date when the Great Pyramid may have been built y Draconis was near to the pole , and must have been used as the pole - star . In the north face of ...
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accepted accurate ancient appear astronomers attraction bodies bright calculations called catalogue cause centre century Chinese circle comet compared complete Copernicus determined diameter direction discovered discovery distance earth eclipse effect elements enabled epicycles equal error explain fact fixed follow force four Galileo gave give given gravitation heavens held Herschel increased interesting Jupiter Kepler knowledge known later LIBRARIES light lunar Mars mass mathematical mean measured method miles moon moon's motion move Newton noticed object observations Observatory opposition orbit original parallax pass period photographic physical planet planetary pole position predicted progress proper motion proved records researches revolve ring rotation round Royal satellites seems seen showed SIGILLUM solar system spectroscope spectrum stars studied sun's supposed surface tables telescope theory tion trace true Tycho Brahe UNIVERSITY VERITAS