Clock, the astronomical, 41, 90 Comets, 201, 203 Constellations, the, 241 Corona, of the sun, 135 Coronium, 152 Corona Borealis, 24 Day, change of, 99, 101 Day and night, 96 December, aspect of sky in, 256 Declination, 31, 35 Dipper, the Great, 21; the Little, 23 Earth, description of the, 67; weight of, 73 Eclipses, 163 Ecliptic, 43 Elements, chemical, in the sun, 151 Equator, 38 Equinoxes, 45 Eros, the asteroid, 142 February, aspect of sky in, 249 Galaxy, the, 233 Gravitation, laws of, 70 “Greenwich of the Sky,” 32 Heavens, apparent motion of, 19 Helium, 152 Horizon, 10, 12; dip of, 86 Hour Circles, 31 January, aspect of sky in, 248 July, aspect of sky in, 252 June, aspect of sky in, 252 Jupiter, the planet, 189 Kepler, laws of, 173 Latitude, terrestrial, 30; celestial, 49, 51 Light, pressure of, 206 Longitude, terrestrial, 30; celestial, 49, 51 Magnitudes, stellar, 220 March, aspect of sky in, 250 Mars, the planet, 181 May, aspect of sky in, 251 Mercury, the planet, 175 Meteors, 210 Meteorites, 214 Milky Way, the, 233 Molecules, escape from planetary atmospheres, 158 Moon, description of, 153; how earth controls, 75 Motion, proper, of solar system, 232 Nadir, 11 Nebulæ, 236 Nebular Hypothesis, 239 Neptune, the planet, 199 Noon-line, 12 North Point, 20 North Pole, 27, 37 North Star, 20, 27, 61 November, aspect of sky in, 255 Nutation, 63 Oblique sphere, 39 October, aspect of sky in, 254 Oppositions, of Mars, 183 Orbits of planets, 7, 52 Orion, nebula in, 236 Parallax, 136, 139 Parallel sphere, 38 Perihelion, 8 Phases of the moon, 160 Photography, in astronomy, 240 Photometry, of stars, 220 Photosphere of sun, 134 Planets, description of the, 172 Polar circles, 111 Precession of the Equinoxes, 55 Refraction, 83, 85 Right Ascension, 31, 35 Right sphere, 39 Rotation, effect of earth's, 5 Saturn, description of, 195 Seasons, the, 104, 107; secular change of, 115 September, aspect of sky in, 254 Signs of Zodiac, 54 Spectroscopic analysis, 145, 147; shifting of lines, 227 Sphere, celestial, 9 Solstices, the, 47 Stars, the fixed, 219; daily revolution of, 25; how to locate, 29; luminosity of, 222; spectra of, 221; variable, 225; temporary, 235; double and multiple, 226 Sun, the description of, 127 Sun-spots, 131 Temperature, of sun, 130 Temporary stars, 235 Tides, the, 76, 79 Time, 89; sidereal and solar, 93 Transits, of Venus, 140, 141 Tropics, the, 111 Universe, appearance of, 8 Uranus, description of, 199 Ursa Major, 21 Variable stars, 225 Vega, 63 Venus, the planet, 178 Vernal Equinox, 32, 42, 46 Zenith, 10 Zodiac, 50 ------------------------------------------------------------------------