Fourteen Weeks in Descriptive Astronomy |
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Page 36
... EQUINOCTIAL , and the ECLIPTIC Systems . Each of these has ( 1 ) its Principal Circle , ( 2 ) its Subordinate Circles , ( 3 ) its Points , and ( 4 ) its Meas- urements . • I. THE HORIZON SYSTEM . ( a ) The PRINCIPAL 36 INTRODUCTION .
... EQUINOCTIAL , and the ECLIPTIC Systems . Each of these has ( 1 ) its Principal Circle , ( 2 ) its Subordinate Circles , ( 3 ) its Points , and ( 4 ) its Meas- urements . • I. THE HORIZON SYSTEM . ( a ) The PRINCIPAL 36 INTRODUCTION .
Page 37
... Horizon is the small circle where the earth and sky seem to meet ; it is parallel to the rational horizon , but distant from it the semi - diameter of the earth . No two places have the same sensible horizon : any two on opposite sides ...
... Horizon is the small circle where the earth and sky seem to meet ; it is parallel to the rational horizon , but distant from it the semi - diameter of the earth . No two places have the same sensible horizon : any two on opposite sides ...
Page 38
... horizon , North or South . Altitude is the distance from the horizon , meas- ured on a vertical circle toward the zenith . Zenith distance ( the complement of Altitude ) is the distance from the zenith , measured on a vertical circle ...
... horizon , North or South . Altitude is the distance from the horizon , meas- ured on a vertical circle toward the zenith . Zenith distance ( the complement of Altitude ) is the distance from the zenith , measured on a vertical circle ...
Page 58
... horizon without being confronted by his imperturbable telescope . " Besides this , it has now been found that the activity of the sun's spots goes through another regular period of about 56 years . Independently of this conclusion , it ...
... horizon without being confronted by his imperturbable telescope . " Besides this , it has now been found that the activity of the sun's spots goes through another regular period of about 56 years . Independently of this conclusion , it ...
Page 83
... horizon . Its elevation increases evening by evening , but never exceeds 30 ° . * If we watch it closely , we shall find that it again ap- * This distance varies much , owing to the eccentricity of Mer cury's orbit . proaches the sun ...
... horizon . Its elevation increases evening by evening , but never exceeds 30 ° . * If we watch it closely , we shall find that it again ap- * This distance varies much , owing to the eccentricity of Mer cury's orbit . proaches the sun ...
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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