The Table of Contents does not mention the “Table of Useful
Astronomical Facts”, which begins on page 391, immediately preceding
the Index.
Punctuation, hyphenation, and spelling were made consistent when a
predominant preference was found in the original book; otherwise they
were not changed.
Simple typographical errors were corrected; unbalanced quotation
marks were remedied when the change was obvious, and otherwise left
unbalanced.
Illustrations in this eBook have been positioned between paragraphs
and outside quotations. In versions of this eBook that support
hyperlinks, the page references in the List of Illustrations lead to
the corresponding illustrations.
The index was not checked for proper alphabetization or correct page
references.
Page 208: The reference to page 124 should be to page 128.