book cover

ASTRONOMY
FOR YOUNG FOLKS

Northern Portion of the Moon at Last Quarter

Taken with 100-inch Hooker Telescope of the Mt. Wilson Observatory(See Chapter XXI)

ASTRONOMY
for
YOUNG FOLKS

BY

ISABEL MARTIN LEWIS, A. M.

(Connected with the Nautical Almanac Officeof 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.


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CONTENTS