Fourteen Weeks in Descriptive Astronomy |
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Page 91
... varies at aphelion and peri- helion within the limits of a half million miles against 15,000,000 miles in the case of the former planet . She makes a complete revolution around the sun in about 225 days , at the mean rate of 22 miles ...
... varies at aphelion and peri- helion within the limits of a half million miles against 15,000,000 miles in the case of the former planet . She makes a complete revolution around the sun in about 225 days , at the mean rate of 22 miles ...
Page 105
... varying velocities , so the stars appear to revolve at different rates of speed . Those near the pole , having a small orbit , revolve very slowly , while those near the celestial equator move at the greatest speed . Appearance of the ...
... varying velocities , so the stars appear to revolve at different rates of speed . Those near the pole , having a small orbit , revolve very slowly , while those near the celestial equator move at the greatest speed . Appearance of the ...
Page 113
... varies . When more than half of a hemi- sphere is in the light , its days are longer than the nights , and vice versa . VII . The seasons and the comparative length of days and nights in the South Temperate Zone , at any specified time ...
... varies . When more than half of a hemi- sphere is in the light , its days are longer than the nights , and vice versa . VII . The seasons and the comparative length of days and nights in the South Temperate Zone , at any specified time ...
Page 116
... varies.- * The precise time of the equinoxes and solstices varies each year , but within a small limit . We notice , from what we have just seen , 116 THE SOLAR SYSTEM .
... varies.- * The precise time of the equinoxes and solstices varies each year , but within a small limit . We notice , from what we have just seen , 116 THE SOLAR SYSTEM .
Page 118
... Varying velocity of the earth . We can see , by looking at the plate , that the velocity of the earth must vary in different portions of its orbit . When passing from the vernal equinox to aphelion , the attraction of the sun tends to ...
... Varying velocity of the earth . We can see , by looking at the plate , that the velocity of the earth must vary in different portions of its orbit . When passing from the vernal equinox to aphelion , the attraction of the sun tends to ...
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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