Youth's Book of Astronomy

annual revolution appear ascertained asteroids astronomers atmosphere atmospheric refraction attraction axis balloon called cause celestial body centre Ceres changes circle climate clouds comets consequence dark days and nights degrees diameter difference diminishes direction discovered distance diurnal motion diurnal revolution earth earth's orbit east eclipse equal equator feet fixed stars full moon gas balloon globe half heavenly bodies heavens height Hence Herschel horizon increased inhabitants Jupiter latitude length less longitude lunar eclipse magnitude Mars Mercury meridian millions of miles minutes months move naked eye nearest nearly north pole northern hemisphere oblique observations orbit parallax passes period phenomena planets polar proportion Ptolemy quantity rays refraction respect revolve rise satellites Saturn seasons seen shadow side Sirius solar eclipse solar system spots sun and moon sun's supposed surface telescope thousand three hundred tides tion tropical velocity Venus Vesta visible whole wind winter zodiac