History of Astronomy |
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Page 55
... surface in space , exactly as the axis of a top describes a cone , if the top has a sharp point , and is set spinning and displaced from the vertical . He actually calculated the amount ; and so he explained the cause of the precession ...
... surface in space , exactly as the axis of a top describes a cone , if the top has a sharp point , and is set spinning and displaced from the vertical . He actually calculated the amount ; and so he explained the cause of the precession ...
Page 82
... surface of mercury . The design was so simple , and seemed so perfect , that great expectations were entertained . But unaccountable variations comparable with those of the transit circle . appeared , and the instrument was put out of ...
... surface of mercury . The design was so simple , and seemed so perfect , that great expectations were entertained . But unaccountable variations comparable with those of the transit circle . appeared , and the instrument was put out of ...
Page 95
... SURFACE , Scheiner was the first to see the spots . They all did good work . The spots were found to be ever varying in size and shape . Sometimes , when a spot disappears at the western limb of the sun , it is never seen again . In ...
... SURFACE , Scheiner was the first to see the spots . They all did good work . The spots were found to be ever varying in size and shape . Sometimes , when a spot disappears at the western limb of the sun , it is never seen again . In ...
Page 96
... surface . Speculations as to the cause of sun - spots have never ceased from Galileo's time to ours . He supposed them to be clouds . Scheiner said they were the indications of tumultuous movements occasionally agitating the ocean of ...
... surface . Speculations as to the cause of sun - spots have never ceased from Galileo's time to ours . He supposed them to be clouds . Scheiner said they were the indications of tumultuous movements occasionally agitating the ocean of ...
Page 97
... surface , and , after many years of work , arrived at a law of frequency which has been more fruitful of results than any discovery in solar physics . In 1843 he announced a decennial period of maxima and minima of sun - spot displays ...
... surface , and , after many years of work , arrived at a law of frequency which has been more fruitful of results than any discovery in solar physics . In 1843 he announced a decennial period of maxima and minima of sun - spot displays ...
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accurate observations Airy astro Astronomer Royal Astronomia Nova astronomical units attraction axis bright calculations Cape Cassini catalogue centre century comet compute Copernicus diameter discovered discovery earth eclipse epicycles equatoreal error excentric explain fact fixed stars Galileo Greenwich Halley heavenly bodies heavens heliometer Hipparchus Huggins hydrogen hypothesis instruments Johann Kepler John Herschel Jupiter Jupiter's Kepler Laplace Lick Observatory light line of apses line of sight lunar Mars mathematical mean distance mean motion measured Mercury meteor method miles a second moon moon's nebulæ Newton Observatory orbit parallax perihelion period photographic physical planet planetary pole position predicted proper motion proved Ptolemy R. S. Phil records refractor retrograde retrograde motion revolution revolve round ring rotation round the sun satellites seems showed Sirius solar system spectra spectroscope spectrum spots stellar sun-spots sun's surface supposed tables telescope theory tion Trans Tycho Brahe Uranus velocity Venus Verrier zenith