ILLUSTRATIONS
Reading edition
PAGE
The Lunar “Crater” Copernicus Frontispiece
Photograph of South Polar Region of the Moon 8
The Moon near the “Crater” Tycho 20
Drawing of Jupiter 28
Drawing of Jupiter 28
Jupiter 38
Saturn 46
Saturn 46
The Milky Way about Chi Cygni 58
The Great Southern Star-Cluster in Centauri 64
Photograph of a Group of Sun-Spots 76
Polar Streamers of the Sun, Eclipse of 1889 89
Solar Corona at the Eclipse of 1871 89
Morehouse's Comet, October 15, 1908 96
Morehouse's Comet, November 15, 1908 96
Head of the Great Comet of 1861 105
Halley's Comet, May 5, 1910 105
xThe Six-Tailed Comet of 1744 112
Spiral Nebula in Ursa Major (M 101) 124
The Whirlpool Nebula in Canes Venatici 124
Tress Nebula (N. G. C. 6992) in Cygnus 132
The Great Andromeda Nebula 140
Spiral Nebula in Cepheus (H. IV. 76) 154
Nebulous Groundwork in Taurus 154
Nebula in Sagittarius (M. 8) 162
The Great Nebula in Orion 180
Photographs of Mars 200
Schiaparrelli’s Chart of Martian “Canals” 220
ILLUSTRATIONS IN THE TEXT
The Rational and the Sensible Horizon 12
Altitude and Azimuth 14
Right Ascension and Declination 35
The Ecliptic and Celestial Latitude and Longitude 51
How the Earth Controls the Moon 75
The Tidal Force of the Moon 79
Refraction 85
Dip of the Horizon 87
Sidereal and Solar Time 93
xiThe Change of Day 101
The Seasons 107
Parallax of the Moon 139
Parallax of the Sun from Transit of Venus 141
Spectrum Analysis 147
The Phases of the Moon 160
Orbits of Mars and the Earth 183
Ellipse, Parabola, and Hyperbola 203
The North Circumpolar Stars 244
Key to North Circumpolar Stars 245
1PART I.
THE CELESTIAL SPHERE.
3