Fourteen Weeks in Descriptive Astronomy |
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Page 138
... parallax . In astronomical calculations , the position of a body as seen from the earth's surface is called its apparent place , while that in which it would be seen from the centre of the earth is called its true place . Thus , in the ...
... parallax . In astronomical calculations , the position of a body as seen from the earth's surface is called its apparent place , while that in which it would be seen from the centre of the earth is called its true place . Thus , in the ...
Page 139
... parallax of the star S is the angle OSR , which is measured by the line OR the semi - diam- eter of the earth . The sun's horizontal parallax ( 8.94 " ) is the angle subtended ( measured ) by the earth's semi - diameter as seen from ...
... parallax of the star S is the angle OSR , which is measured by the line OR the semi - diam- eter of the earth . The sun's horizontal parallax ( 8.94 " ) is the angle subtended ( measured ) by the earth's semi - diameter as seen from ...
Page 194
... parallax of the stars , since they have an orbit of 5,500 million miles in diameter , and hence the angle must be 30 times as great as that which the terrestrial orbit affords . TELESCOPIC FEATURES . — On account of the recent- ness of ...
... parallax of the stars , since they have an orbit of 5,500 million miles in diameter , and hence the angle must be 30 times as great as that which the terrestrial orbit affords . TELESCOPIC FEATURES . — On account of the recent- ness of ...
Page 302
... parallax . The arc G'C ' measures the angle C'MG ' ; that angle is equal to the opposite angle GMC 1 ° . Now , in the four- sided figure GECM , the sides GE ... parallax in the same manner as the lunar parallax . 302 THE SIDEREAL SYSTEM .
... parallax . The arc G'C ' measures the angle C'MG ' ; that angle is equal to the opposite angle GMC 1 ° . Now , in the four- sided figure GECM , the sides GE ... parallax in the same manner as the lunar parallax . 302 THE SIDEREAL SYSTEM .
Page 304
... parallax . The result of these observations fixed the solar parallax at 8.94 " . * ( 2. ) Calculation of solar parallax by observation of the transit of Venus . In the figure , let A and B rep- resent the positions of two observers ...
... parallax . The result of these observations fixed the solar parallax at 8.94 " . * ( 2. ) Calculation of solar parallax by observation of the transit of Venus . In the figure , let A and B rep- resent the positions of two observers ...
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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