A beginner's star-book; an easy guide to the stars and to the astronomical uses of the opera-glass, the field-glass and the telescope . nd tenth 71, ]2, are Wilhelm I. and Longomontanus, the latter a superb walled plain 90 milesin diameter, the highest peak upon its ramparts rising 13,314 feet. Clavius, No. 76, isregarded by many as the most variedly beautiful of all the lunar formations. Includingan area of over 15,000 square miles, the peaks upon its walls rise at two points to at least15,000 and 17,000 feet, and upon its great floor are at least five clearly defined 7
A beginner's star-book; an easy guide to the stars and to the astronomical uses of the opera-glass, the field-glass and the telescope . nd tenth 71, ]2, are Wilhelm I. and Longomontanus, the latter a superb walled plain 90 milesin diameter, the highest peak upon its ramparts rising 13,314 feet. Clavius, No. 76, isregarded by many as the most variedly beautiful of all the lunar formations. Includingan area of over 15,000 square miles, the peaks upon its walls rise at two points to at least15,000 and 17,000 feet, and upon its great floor are at least five clearly defined 74, 75, are Gruenberger and Moretus, not well placed for observation, and less inter-esting than the objects just noted; diameters 40 and 78 miles respectively. Within theSea of Showers, F, we find the ring-plains—]], 78, 79, 80. The first of these, Timocharis,though only 23 miles in diameter, is the centre of one of the smaller ray systems; its floorlies some 3000 feet lower than the level of the sea. Archimedes, 78, is a far finer spec-tacle though its depth below the level of the sea is not so great. Its great walls, however,. KEY-MAP TO MOON, AT NINE AND THREE-QUARTER DAYS See accompanying text, with illustration opposite ^bc fIDoon in tbc ^Telescope 77 rise to a height of 4000 feet above its floor. Aristillus, 79, and Autolycus, 80, are ring-plains 34 and 2T, miles in diameter, respectively,—the former having a broken and variedborder and a fine central mountain. These objects, beginning with Archimedes, No. 78,are again illustrated on a far larger scale on p. 79. The reader will there find a clearer view also of such mountainranges as the Apennines, 57;the Caucasus, 59; the Alps,60; as well as a closer view ofPlato, 56, and other objectsdesignated in the Key-Mapson pp. 76 and 74. Southward — or abovethe great Copernicus, 51—lies Rheinhold, 81; andfarther still to the south-ward lies Bullialdus, 82,—both formations being nowalmost at the verge of theterminator. Th
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Keywords: ., bookcentury1900, bookdecade19, booksubjectastronomy, bookyear1912
