Chapter I: Front Matter

ASTRONOMY
FOR YOUNG FOLKS

ASTRONOMY

_for_

YOUNG FOLKS

BY

ISABEL MARTIN LEWIS, A. M.

(_Connected with the Nautical Almanac Office
of the U. S. Naval Observatory_)

NEW YORK
DUFFIELD AND COMPANY
1922

Copyright, 1921, by
THE CENTURY COMPANY

Copyright, 1922, by
DUFFIELD AND COMPANY

Printed in U. S. A.

CONTENTS

CHAPTER PAGE

Preface xiii

I. The Constellations 3

II. January 15

III. February 21

IV. March 28

V. April 35

VI. May 41

VII. June 49

VIII. July 56

IX. August 64

X. September 71

XI. October 78

XII. November 84

XIII. December 90

XIV. Stars of the Southern Hemisphere 96

XV. The Milky Way or Galaxy 107

XVI. The Surface of the Sun 113

XVII. The Solar System 119

XVIII. The Origin of the Earth 127

XIX. Jupiter and His Nine Moons 139

XX. The Rings and Moons of Saturn 148

XXI. Is the Moon a Dead World 156

XXII. Comets 165

XXIII. Meteorites 173

XXIV. The Earth As a Magnet 183

XXV. Some Effects of the Earth's Atmosphere Upon
Sunlight 193

XXVI. Keeping Track of the Moon 207

XXVII. The Motions of the Heavenly Bodies 216

XXVIII. The Evolution of the Stars--From Red Giants
to Red Dwarfs 225

XXIX. Double and Multiple Stars 230

XXX. Astronomical Distances 241

XXXI. Some Astronomical Facts Worth Remembering 250

ILLUSTRATIONS

PAGE

Northern Portion of the Moon at Last Quarter _Frontispiece_

The Great Hercules Cluster--A Universe of Suns _facing page_ 56

A Dark Nebula: The Dark Bay or Dark Horse
Nebula in Orion _facing page_ 110

A. Venus. B. Mars. C. Jupiter. D. Saturn _facing page_ 122

Spiral Nebula in Canes Venatici _facing page_ 216

Spiral Nebula in Andromeda Viewed Edgewise _facing page_ 222

LIST OF TABLES

PAGE

I. The Principal Elements of the Solar System 261

II. The Satellites of the Solar System 262

III. The Twenty Brightest Stars in the Heavens 263

IV. A List of the Principal Constellations 264-265

V. Pronunciations and Meanings of Names of
Stars and Constellations 266-267