| photographs nebulÆ, | 32 |
| "Keyhole" nebula, | 205 |
| Lambert, determines longitude of Washington, | 168 |
| Laplace, discusses Saturn's rings, | 146 |
| nebular hypothesis, | 33 |
| stability of solar system, | 210 |
| Latitude, changes of, | 133, 138 |
| definition of, | 134 |
| determining the, | 6 |
| Leverrier, predicts discovery of Neptune, | 61, 142 |
| Lick Observatory, Keeler's observations, | 140 |
| Light, undulatory theory of, | 19, 148 |
| Light-waves, measuring length of, | 20, 149 |
| Logogriph, by Huygens, | 143 |
| Long-exposure photography, | 85 |
| Longitude, counted East and West, | 125 |
| determining, | 6 |
| determining by occultations, | 167 |
| effect on time differences, | 123 |
| explained, | 123 |
| of Washington, first determined, | 168 |
| Maclear, observes Eta Argus, | 205 |
| Magnitudes, stellar, | 91 |
| Manila, its time, | 127 |
| Maps, astronomical side of, | 112 |
| 189 | |
| Milky-way, poor in nebulÆ, | 33 |
| Minor Planets, see Asteroids. | |
| Moon, Hoax, | 199 |
| motion among stars, | 163 |
| mountains discovered by Galileo, | 49 |
| size of, measured, | 166 |
| Motion of moon, | 163 |
| Motions of the Earth's Pole, | 131 |
| Mounting Great Telescopes, | 170 |
| Naked-eye nebulÆ, | 28 |
| Naples, Royal Observatory, latitude observations, | 139 |
| Naval Observatory, Washington, noon signal, | 120 |
| Navigation, | 1 |
| before chronometers, | 3 |
| use of astronomy in, | 11339 |
| Semi-lenses of heliometer, | 155 |
| Sextant, how used, | 4 |
| Sicily, latitude station in, | 139 |
| Sidereus Nuncius, published by Galileo, | 52 |
| Simplicio, character in Galileo's Dialogue, | 55 |
| Sirius, brightest star, | 205 |
| Size of Moon, measured, | 166 |
| SociÉtÉ de l'Optique, | 177 |
| Solar parallax, see Sun's distance. | |
| physics, by photography, | 109 |
| system, stability of, | 210 |
| Spectroscope, its use explained, | 147 |
| used on pole-star, | 19 |
| to observe Saturn's rings, | 147 |
| Spiral nebulÆ, | 31 |
| Stability, of Saturn's rings, | 145 |
| of Solar System, | 210 |
| Standards, time, of the world, | 111 |
| table of, | 130 |
| 127 | |
| Star-catalogue, general photographic, | 102 |
| Star-clusters, photography of, | 98 |
| Star-distances | 94, 106 |
| measured with heliometer, | 158 |
| Rutherfurd, | 94 |
| Star magnitudes, | 91 |
| Star-motion, toward us, | 21 |
| Star-tables, astronomical, | 118 |
| Stars, variable, | 42 |
| St Gothard railway, tunnels, | 220 |
| Sun, newspaper, the moon hoax, | 201 |
| Sun-Dial, How to Make a, | 69 |
| 210 | |
| distance, compared with star distance, | 97 |
| measured with Eros, | 67, 106 |
| motion, apex of, | 221 |
| Sun-spots, discovered by Galileo, | 49 |
| Systema Saturnium, Huygens, | 143 |
| Telescope, clock, | 175 |
| at Paris Exposition, | 176, 180 |
| double, for photography, | 86 |
| equatorial, explained, | 170 |
| first used by Galileo, | 49 |
| motion o TRANSCRIBER'S NOTE Fractions in the two tables on pg 74 and pg 78 are in the form "a b-c" in the original text, for example "2 7-16", and this form is retained in the etext. A few other basic fractions in the text such as ½ and ? 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'. |
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