Fourteen Weeks in Descriptive Astronomy |
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Page 17
... surface into zones , and the theory of the obliquity of the ecliptic . He also predicted an eclipse of the sun which is memorable in ancient history as having terminated a war between the Medes and Lydians . These nations were engaged ...
... surface into zones , and the theory of the obliquity of the ecliptic . He also predicted an eclipse of the sun which is memorable in ancient history as having terminated a war between the Medes and Lydians . These nations were engaged ...
Page 33
... surface of the earth is four thousand miles from the centre . He applied this imaginary law . Sup- pose it is removed four thousand miles from the surface of the earth , or eight thousand miles from the centre . Then , as it is twice as ...
... surface of the earth is four thousand miles from the centre . He applied this imaginary law . Sup- pose it is removed four thousand miles from the surface of the earth , or eight thousand miles from the centre . Then , as it is twice as ...
Page 36
... surface of the celestial sphere there are imag- ined to be drawn three systems of circles : the HORI- ZON , the EQUINOCTIAL , and the ECLIPTIC Systems . Each of these has ( 1 ) its Principal Circle , ( 2 ) its Subordinate Circles , ( 3 ) ...
... surface of the celestial sphere there are imag- ined to be drawn three systems of circles : the HORI- ZON , the EQUINOCTIAL , and the ECLIPTIC Systems . Each of these has ( 1 ) its Principal Circle , ( 2 ) its Subordinate Circles , ( 3 ) ...
Page 47
... surface of the sun . More- over , the heat and light stream off into space equally in every direction . Of this vast flood only one twenty - three hundred millionth part reaches the earth . It is said that if the heat of the sun were ...
... surface of the sun . More- over , the heat and light stream off into space equally in every direction . Of this vast flood only one twenty - three hundred millionth part reaches the earth . It is said that if the heat of the sun were ...
Page 48
... surface of the sun when at its average ( mean ) distance by 1000 , the same sur- face will be represented to us when in aphelion ( July ) by 940 , and when in perihelion ( January ) by 1072 . DIMENSIONS . - Its diameter is about 850,000 ...
... surface of the sun when at its average ( mean ) distance by 1000 , the same sur- face will be represented to us when in aphelion ( July ) by 940 , and when in perihelion ( January ) by 1072 . DIMENSIONS . - Its diameter is about 850,000 ...
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Common terms and phrases
ancients Andromeda angle aphelion appear Aries astronomers atmosphere axis Boötes bright brilliant Canis Minor Capricornus Cassiopeia cause Celestial Sphere centre Cepheus circle color comet conjunction constellation Cor Caroli dark density Describe diameter disk earth east ecliptic equal equator equinoctial figure fixed stars full moon globe heat heavenly bodies heavens Hercules Herschel horizon inclined inferior conjunction inferior planet Jupiter latitude length light luminous lunar Lyra magnitude Mars mean distance Mercury meridian meteors miles moon's motion move naked eye nearly nebula Neptune night node north pole Orion parallax pass path penumbra perihelion Perseus Pisces polar Polaris precession rays revolve ring rising Saturn seasons seen shine side sidereal sidereal day solar day solar system solstice space spots summer sun's surface synodic revolution tance Taurus telescope theory tion Uranus Ursa Major Ursa Minor varies velocity Venus vernal equinox visible winter Zodiac