Fourteen Weeks in Descriptive Astronomy |
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Page 33
... miles from the surface of the earth , or eight thousand miles from the centre . Then , as it is twice as far from the centre , its weight will be diminished 22 , or 4 times . If it were placed 3 , 4 , 5 , 10 times further away , its ...
... miles from the surface of the earth , or eight thousand miles from the centre . Then , as it is twice as far from the centre , its weight will be diminished 22 , or 4 times . If it were placed 3 , 4 , 5 , 10 times further away , its ...
Page 35
... miles , and the two lines will seem to unite : so we must consider this great earth as a mere speck or point at the centre of the Celestial Sphere . Second , that we must even neg- lect the entire diameter of the earth's orbit , so that ...
... miles , and the two lines will seem to unite : so we must consider this great earth as a mere speck or point at the centre of the Celestial Sphere . Second , that we must even neg- lect the entire diameter of the earth's orbit , so that ...
Page 36
... miles further away , or at the very centre of the earth , where our view would be bounded by a great circle of the earth . On the con- cave surface of the celestial sphere there are imag- ined to be drawn three systems of circles : the ...
... miles further away , or at the very centre of the earth , where our view would be bounded by a great circle of the earth . On the con- cave surface of the celestial sphere there are imag- ined to be drawn three systems of circles : the ...
Page 46
... miles . Since the orbit of the earth is elliptical , and the sun is situated at one of its foci , the earth is nearly 3,000,000 miles further from the sun in aphelion than in perihelion . As we attempt to locate the heavenly bodies in ...
... miles . Since the orbit of the earth is elliptical , and the sun is situated at one of its foci , the earth is nearly 3,000,000 miles further from the sun in aphelion than in perihelion . As we attempt to locate the heavenly bodies in ...
Page 47
... miles an hour , would require 341 years to reach its desti- nation . Ten generations would be born and would die ; the young men would become gray - haired , and their great - grandchildren would forget the story of the beginning of ...
... miles an hour , would require 341 years to reach its desti- nation . Ten generations would be born and would die ; the young men would become gray - haired , and their great - grandchildren would forget the story of the beginning of ...
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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