Part 23

Uses of astronomy, practical, 112

Variable stars, 42 in Argo, 205

Vega, future pole-star, 187

Visibility of stars, in day-time, 191

Vision, phenomenon of, 20, 149

Washington, its longitude first determined, 168

Waves, explained, 148 of light, 20, 148

Wilkes, at Naval Observatory, Washington, 169

Wilkins, imaginary voyage of, 208

Witt, discovers Eros, 66, 105

Wolf, M, invents asteroid photography, 104 measures Pleiades, 11

World's time standards, table of, 130

Yale College, Pleiades measured at, 15

Zones, time, explained, 128

TRANSCRIBER'S NOTE

Italic text is denoted by underscores.

Fractions in the two tables on pg 74 and pg 78 are displayed in the form "a-b/c" as 4-1/2 or 2-7/16 for example. The original text in the tables used the form "a b-c". A few other basic fractions in the text such as ½ and ⅖ are displayed in this same form in the etext.

There is only one Footnote in this book, with its anchor on pg 69. It has been placed at the end of the chapter containing the anchor.

Obvious typographical errors and punctuation errors have been corrected after careful comparison with other occurrences within the text and consultation of external sources.

Except for those changes noted below, all misspellings in the text, and inconsistent or archaic usage, have been retained. For example, time zone, time-zone; Le Verrier, Leverrier; light wave, light-wave; intrust; wabbling; unexcelled; crape; monumented.

Pg 146, 'James Clark-Maxwell' replaced by 'James Clerk Maxwell'. Pg 189, 'impossible to measure' replaced by 'possible to measure'.