World-life; or, Comparative geology . huisen. Beer and Maedler, Nasmyth, Neison and others,have given us lunar positions which, in the central partsof the moons disc, cannot be in error over 3,000 feet,while the altitudes of the mountains are exact within Besides the results of triangulations, we possess * Phitarch: Be Facie in Orhe Lunce. t Vierteljahresschrift cler Astronomischen Gesellschaft, Leipzig, ix, 233-6. tWe liave a better map of the moons surface, says Professor LewisBoss, of the Dudley Observatory, than of the State of New York {ReiiortNew York State Survey for the year
World-life; or, Comparative geology . huisen. Beer and Maedler, Nasmyth, Neison and others,have given us lunar positions which, in the central partsof the moons disc, cannot be in error over 3,000 feet,while the altitudes of the mountains are exact within Besides the results of triangulations, we possess * Phitarch: Be Facie in Orhe Lunce. t Vierteljahresschrift cler Astronomischen Gesellschaft, Leipzig, ix, 233-6. tWe liave a better map of the moons surface, says Professor LewisBoss, of the Dudley Observatory, than of the State of New York {ReiiortNew York State Survey for the year 1S77, p. 20); and this statement is true ofthe whole territory of the United States. 386 SPECIAL PLAXETOLOGY. the beautiful photographs of the moon, executed byRutherford, de la Rue and Draper; and these show cer-tain features more distinctly than direct telescopic arrange the features of the moons discunder three general heads, Plains, Craters and Mountains;but the last two desio-nations must be understood in a. Fig. 54.—The Moon.[Telescopically inverted. Hence the top is south, the bottom north, theright hand east and the left hand west.] 1. Tycho, 11. Mare Tranquillitatis, 2. Copernicus, 3. Kepler, 4. Aristarchus, 5. Theophilus, 6. PtolemtBus, 7. Bullialdus, 8. Linne, 9. Hyginus,10. Mare Serenitatis, 12. ? Foecunditatis, 13. Xectaris, 14. Crisium, 15. Frigoris, 16. Imbrium, 17. Xubium, 18. ? Humorum, 19, Oceanus Procellarum. special sense, and not as expressing any close analogywith terrestrial features. The plains occupy over half ofthe lunar disc. Most of them are dark and well defined. THE MOOIS. 387 while the remainder are light and undefined. The cratersare divided into nine classes, and the mountains intotwelve, but these numerous modifications need not be men-tioned here. In general character, all the principal craters, so-called,present a sub-circular form, surrounded by a rampartwhich slopes gently outwards, but descends precipitouslyon the i
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