The references are to section numbers.

• Absorption of starlight, 225.
• Absorption spectra, 87.
• Accelerating force, 35.
• Adjustment of observations, 2.
• Albedo of moon, 97.
  • of Venus, 148.
• Algol, 205.
• Altitudes, 4, 21.
• Andromeda nebula, 214.
• Angles, measurement of, 2.
• Angular diameter, 7.
• Annular eclipse, 64.
• Asteroids, 156.
• Atmosphere of the earth, 49.
  • of the moon, 103.
  • of Jupiter, 139.
  • of Mars, 153.
• Aurora, 51.
• Azimuth, 5, 21.
• Biela's comet, 181.
• Bode's law, 134, 232.
• Bredichin's theory of comet tails, 180.
• Calendar, O.S. and N.S., 61.
• Capture of comets and meteors, 176.
• Canals of Mars, 154.
• Celestial mechanics, 32.
• Changes upon the moon, 108.
• Chemical constitution of sun, 116.
  • of stars, 210.
• Chromosphere, the sun's, 124.
• Chronology, 59.
• Classification of stars, 212.
• Clocks and watches, 74.
  • sidereal clock, 12.
• Collisions with comets, 183.
• Colors of stars, 209.
• Comets, general characteristics, 158-164.
  • development of, 179, 181.
  • groups, 177.
  • orbits, 161.
  • periodic, 176.
  • spectra, 182.
  • tails, 180.
• Comets and meteors, relation of, 175.
• Conic sections, 38.
• Constellations, 184.
• Corona, the sun's, 123.
• Craters, lunar, 105.
• Dark stars, 201.
• Day, 52, 62.
• Declination, 21.
• Development of comet, 179.
  • of moon, 241.
  • of nebulÆ, 245.
  • of stars, 242, 244.
  • of sun, 228.
  • of universe, 226.
• Distribution of stars and nebulÆ, 220.
• Diurnal motion, 10, 15.
• Doppler principle, 89.
• Double nebulÆ, 215.
• Double stars, 198.
  • development of, 244.
• Driving clock, 80.
• Earth, atmosphere, 48.
  • mass, 45.
  • size and shape, 44.
  • warming of the earth, 47.
• Eclipses, nature of, 63.
  • annular eclipse, 64.
  • eclipse limits, 68.
  • eclipse maps, 70, 71.
  • number of, in a year, 69.
  • partial eclipse, 64.
  • prediction of, 70, 71.
  • recurrence of, 72.
  • shadow cone, 64, 66.
  • total eclipse, 64.
  • uses of, 73.
• Eclipses of Jupiter's satellites, 141.
• Eclipse theory of variable stars, 205.
• Ecliptic, 26.
  • obliquity of, 25.
• Ellipse, 33.
• Epochs for planetary motion, 30.
• Energy, radiant, 75.
  • condensation of, 76.
• Epicycle, 32.
• Equation of time, 53.
• Equator, 16, 21.
• Equatorial mounting, 80.
• Equinoxes, 25.
• Ether, 75.
• Evening star, 31.
• FaculÆ, 122.
• Falling bodies, law of, 35.
• Finding the stars, 14.
• Fraunhofer lines, 87.
• Galaxy, 219.
• Geography of the sky, 16.
• Graphical representation, 6.
• Grating, diffraction, 84.
• Gravitation, law of, 37.
• Harvest moon, 93.
• Heat of the sun, 118, 126.
• Helmholtz, contraction theory of the sun, 126, 228.
• Horizon, 4, 21.
• Hour angle, 21.
• Hour circle, 21.
• Hyperbola, 38.
• Japetus, satellite of Saturn, 145.
• Jupiter, 136.
  • atmosphere, 139.
  • belts, 137.
  • invisible from fixed stars, 197.
  • orbit of, 29.
  • physical condition, 139.
  • rotation and flattening, 138.
  • satellites, 140.
  • surface markings, 137.
• Kepler's laws, 33, 111.
• Latitude, determination of, 18.
• Leap year, 61.
• Lenses, 77.
• Leonid meteor shower, 172.
  • perturbations of, 174.
• Librations of moon, 98.
• Life upon the planets, 157.
• Light curves, 205.
• Light, nature of, 75.
• Light year, 190.
• Limits of eclipses, 68.
• Longitude, 56.
  • determination of, 58.
• Lunation, 60.
• Magnifying power of telescope, 79.
• Magnitude, stellar, 9, 186.
• Mars, atmosphere, temperature, 150.
  • canals, 154.
  • orbit, 30.
  • polar caps, 152.
  • rotation, 151.
  • satellites, 155.
  • surface markings, 150.
• Mass, determination of, 37.
  • of comets, 164.
  • of double stars, 200.
  • of moon, 94.
  • of planets, 40, 133.
• Measurements, accurate, 1.
• Mercury, 149.
  • motion of its perihelion, 43.
  • orbit of, 30.
• Meridian, 19, 21.
• Meteors, nature of, 165, 169.
  • number of, 167.
  • velocity, 170.
• Meteors and comets, relation of, 175.
• Meteor showers, radiant, 171.
  • Leonids, capture of, 172, 173.
  • perturbations, 174.
• Milky Way, 219.
• Mira, ?Ceti, 204.
• Mirrors, 77.
• Month, 60.
• Moon, 91.
  • albedo, 97.
  • atmosphere, 103.
  • changes in, 108.
  • density, surface gravity, 95.
  • development of, 241.
  • harvest moon, 93.
  • influence upon the earth, 109, 233.
  • librations, 98.
  • map of, 101.
  • mass and size, 94.
  • motion, 24, 92.
  • mountains and craters, 104.
  • phases, 91, 92.
  • physical condition, 100, 107.
• Month, 60.
• Morning star, 31.
• Motion in line of sight, 89, 193.
• Multiple stars, 202.
• Names of stars, 8.
• NebulÆ, 214.
  • density, 217.
  • development of, 245.
  • motion, 218.
  • spectra, 216.
  • types and classes of, 215.
• Nebular hypothesis, 230.
  • objections to, 231.
• Neptune, 146.
  • discovery of, 41.
• Newton's laws of motion, 34.
  • law of gravitation, 37, 43.
• Nodes, 39.
  • relation to eclipses, 67, 71.
• Nucleus, of comet, 160.
• Objective, of telescope, 78.
• Obliquity of ecliptic, 25.
• Observations, of stars, 10.
• Occultation of stars, 103.
• Orbits, of comets, 161.
  • of double stars, 199.
  • of moon, 92.
  • of planets, 28.
• Orion nebula, 215.
• Parabola, 35, 38, 161.
• Parabolic velocity, 38.
• Parallax, 114, 188.
• Penumbra, 64, 121.
• Perihelion, 38.
• Periodic comets, 176.
• Personal equation, 82.
• Perturbations, 39.
  • of meteors, 174.
• Phases, of the moon, 91, 92.
• Photography, 81.
  • of stars, 13.
• Photosphere, of sun, 121.
• Planets, 26, 133.
  • distances from the sun, 134.
  • how to find, 29.
  • mass, density, size, 133.
  • motion of, 27, 38.
  • periodic times of, 30.
• Planetary nebulÆ, 215.
• Pleiades, 16, 215.
• Plumb-line apparatus, 11, 18.
• Poles, 21.
• Precession, 46.
• Prisms, 84.
• Problem of three bodies, 39.
• Prominences, solar, 125.
• Proper motions, 191.
• Protractor, 2.
• Ptolemaic system, 32.
• Radiant energy, 75.
• Radiant, of meteor shower, 171.
• Radius victor, 33.
• Reference lines and circles, 17.
• Refraction, 50.
• Right ascension, 16, 20, 21.
• Roche's limit, 239.
• Rotation, of earth, 55.
  • of Mars, 151.
  • of moon, 99.
  • of Jupiter, 138.
  • of Saturn, 144.
  • of sun, 120, 132.
• Saros, 72.
• Satellites, of Jupiter, 136, 140.
  • of Mars, 155.
  • of Saturn, 145.
• Saturn, 142.
  • ball of, 144.
  • orbit, 29.
  • rings, 142.
  • rotation, 144.
  • satellites, 145.
                                                                                                                                                                                                                                                                                                             
  
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