Fourteen Weeks in Descriptive Astronomy |
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Page 38
... Sphere . ( b ) SUBORDINATE CIRCLES . - These are the Hour Circles ( Right Ascension Meridians ) and the Decli- nation Parallels . The Hour Circles are thus lo- cated . The Equinoctial is divided into 360 ° , equal to twenty - four hours ...
... Sphere . ( b ) SUBORDINATE CIRCLES . - These are the Hour Circles ( Right Ascension Meridians ) and the Decli- nation Parallels . The Hour Circles are thus lo- cated . The Equinoctial is divided into 360 ° , equal to twenty - four hours ...
Page 39
... Sphere , and are the extremities of the celestial axis , just as the poles of the earth are the extremities of the earth's axis . The North Point is marked very nearly by the North Star , and every direction from that is reckoned South ...
... Sphere , and are the extremities of the celestial axis , just as the poles of the earth are the extremities of the earth's axis . The North Point is marked very nearly by the North Star , and every direction from that is reckoned South ...
Page 41
... Sphere . ( Little used . ) The Equinoxes are the points where the ecliptic intersects the equinoctial . The place where the sun crosses the equinoctial * in going North , which occurs about the 21st of March , is called the Vernal ...
... Sphere . ( Little used . ) The Equinoxes are the points where the ecliptic intersects the equinoctial . The place where the sun crosses the equinoctial * in going North , which occurs about the 21st of March , is called the Vernal ...
Page 48
... sphere . It seems a little larger to us in winter than in summer , as we are 3,000,000 miles nearer it . If we represent the luminous surface of the sun when at its average ( mean ) distance by 1000 , the same sur- face will be ...
... sphere . It seems a little larger to us in winter than in summer , as we are 3,000,000 miles nearer it . If we represent the luminous surface of the sun when at its average ( mean ) distance by 1000 , the same sur- face will be ...
Page 62
... sphere may be smaller than that in the inner or cloudy atmosphere ; in that case there will be a black spot without a penumbra . It will be natural to suppose that when the heated gas of the photo- sphere or second atmosphere is thus ...
... sphere may be smaller than that in the inner or cloudy atmosphere ; in that case there will be a black spot without a penumbra . It will be natural to suppose that when the heated gas of the photo- sphere or second atmosphere is thus ...
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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