Fourteen Weeks in Descriptive Astronomy |
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Page 58
... Herschel relates that when examining a spot through his telescope , he turned away for a moment , and on looking back it was gone . The appearance of the spots is periodical . — It is a re- markable fact that the number of spots ...
... Herschel relates that when examining a spot through his telescope , he turned away for a moment , and on looking back it was gone . The appearance of the spots is periodical . — It is a re- markable fact that the number of spots ...
Page 279
... Herschel in 1838 , had in the centre a vacant space containing a star of the first magnitude completely enshrouded by nebulous matter . In 1863 , the nebulous matter had disap- peared , and the star was only of the sixth magni- tude ...
... Herschel in 1838 , had in the centre a vacant space containing a star of the first magnitude completely enshrouded by nebulous matter . In 1863 , the nebulous matter had disap- peared , and the star was only of the sixth magni- tude ...
Page 281
... Herschel's theory . - Sir W. Herschel has conjec- tured that the stars are not indifferently scattered through space , but are collected in a stratum some- thing like that shown in the cut , and that our sun Fig . 89 . B E C occupies a ...
... Herschel's theory . - Sir W. Herschel has conjec- tured that the stars are not indifferently scattered through space , but are collected in a stratum some- thing like that shown in the cut , and that our sun Fig . 89 . B E C occupies a ...
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Common terms and phrases
ancients angle aphelion appear astronomers atmosphere axis bright brilliant called Capricornus Cassiopeia Celestial Sphere centre circle color comet conjunction constellation Cor Caroli dark density diameter disk earth east ecliptic equal equator equinoctial figure fixed stars full moon globe heat heavenly bodies heavens Hercules Herschel horizon inclined inferior inferior conjunction inferior planet Jupiter latitude length light longitude luminous lunar magnitude Mars mean distance measured Mercury meridian meteors miles moon moon's motion move naked eye nearly nebula Neptune night node north pole obliquity observer orbit parallax pass path penumbra perihelion Perseus planet polar position rays revolve Right Ascension ring rotation satellites Saturn seasons seen shadow shine side sidereal sidereal day solar system space spots summer sun's superior planet supposed surface synodic revolution tance Taurus telescope theory tion Uranus Ursa Major varies velocity Venus vernal equinox visible zenith zodiac