ILLUSTRATIONS

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]
The 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]
The 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]

PART I.

THE CELESTIAL SPHERE.

PART I.
THE CELESTIAL SPHERE.