Fourteen Weeks in Descriptive Astronomy |
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Page 33
... attraction of the earth diminishes according to the square of the distance . He knew ( according to the measurement then received ) that a body on the surface of the earth is four thousand miles from the centre . He applied this ...
... attraction of the earth diminishes according to the square of the distance . He knew ( according to the measurement then received ) that a body on the surface of the earth is four thousand miles from the centre . He applied this ...
Page 45
... attracted by all . First , the Sun , a great central globe , so vast as to overcome the attraction of all the planets , and compel them to circle around him ; next , the planets , each turning on its axis while it flies around the sun ...
... attracted by all . First , the Sun , a great central globe , so vast as to overcome the attraction of all the planets , and compel them to circle around him ; next , the planets , each turning on its axis while it flies around the sun ...
Page 49
... attraction which holds our own earth and all the planets steadily in their places ; while it fills the mind with an indescribable awe as we think of that Being who made the sun , and holds it in the very palm of his hand . The density ...
... attraction which holds our own earth and all the planets steadily in their places ; while it fills the mind with an indescribable awe as we think of that Being who made the sun , and holds it in the very palm of his hand . The density ...
Page 50
... attraction is largely diminished , since that decreases , we remember , as the square of the distance . However , a man weighing at the earth's equator 150 lbs . , at the sun's equator would weigh about 4,080 lbs . , a force of attraction ...
... attraction is largely diminished , since that decreases , we remember , as the square of the distance . However , a man weighing at the earth's equator 150 lbs . , at the sun's equator would weigh about 4,080 lbs . , a force of attraction ...
Page 52
... spot over 107,000 miles broad was distinctly seen , and attracted general attention in this country . Some who read this paragraph will doubtless recall its ap- pearance . In 1839 , Captain Davis saw one which 52 THE SOLAR SYSTEM .
... spot over 107,000 miles broad was distinctly seen , and attracted general attention in this country . Some who read this paragraph will doubtless recall its ap- pearance . In 1839 , Captain Davis saw one which 52 THE SOLAR SYSTEM .
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Common terms and phrases
ancients Andromeda angle aphelion appearance Aries astronomers atmosphere axis body Boötes bright brilliant Canis Minor Capricornus Cassiopeia celestial centre Cepheus circle color comet conjunction constellation Cor Caroli dark density Describe diameter disk Draco earth east ecliptic equal equator equinoctial figure fixed stars full moon globe heat heavens Hercules Herschel horizon inclined inferior inferior conjunction inferior planet Jupiter latitude length light lunar Lyra magnitude Mars mean distance Mercury meridian meteors miles moon moon's motion move naked eye nearly nebula Neptune node north pole orbit Orion parallax pass path penumbra perihelion Perseus Pisces planet Polaris precession rays revolve ring rising Saturn seasons seen shadow shines shower sidereal sidereal day solar day solar system space spots summer sun's superior planet surface synodic revolution tance Taurus telescope theory tion Uranus Ursa Major Ursa Minor varies velocity Venus vernal equinox visible zodiac