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It has been the aim of the authors to give in this book a brief,
simple, and accurate account of the heavens as they are known to
astronomers of the present day. It is believed that there is
nothing in the book beyond the comprehension of readers of ordinary
intelligence, and that it contains all the information on the
subject of astronomy that is needful to a person of ordinary
culture. The authors have carefully avoided dry and abstruse
mathematical calculations, yet they have sought to make clear the
methods by which astronomers have gained their knowledge of the
heavens. The various kinds of telescopes and spectroscopes have
been described, and their use in the study of the heavens has been
fully explained.
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