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 . regular, but it covers anarea almost as large. Petavius, No. 6, is even larger than the preceding. The smallerformation at the right is called Wrottesley; and on this side the border of Petavius risesto 11,000 feet. A deep sharp cleft running from almost the centre of Petavius upwardtoward the right seems to have been first noted by the German observer, Schroeter, , 1788. One peak of the central mountains here reaches a height of 6000 feet abovethe floo
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 . regular, but it covers anarea almost as large. Petavius, No. 6, is even larger than the preceding. The smallerformation at the right is called Wrottesley; and on this side the border of Petavius risesto 11,000 feet. A deep sharp cleft running from almost the centre of Petavius upwardtoward the right seems to have been first noted by the German observer, Schroeter, , 1788. One peak of the central mountains here reaches a height of 6000 feet abovethe floor. Snellius (No. 7) and Stevinus (No. 8) are also ring-plains, the former 50 milesin diameter, the latter a little larger—though showing smaller in our photograph. InFurnerius, No. 9, we have another walled plain almost as large as Langrenus, though mereirregular in form. Returning to the region of the Sea of Conflicts (A) we note to the north (rememberthat in our map south is above, north below, as in an astronomical telescope) the fine for-mation called Cleomedes, No. 10. It is oblong in shape, about 78 miles in diameter, and. KEY-MAP TO THE MOON, AT TWO DAYS ^ee accompanying text, -with illustration opposite Zhc flDoon in tbe G:elc0cope 73 its huge walls rise from 8000 to 10,000 feet above the floor. Just below, No. 11, is Burck-hardt, 35 miles in diameter, chiefly characterized by the great relative height of its easternwall (observers right), which rises to nearly 13,000 feet. The objects Nos. 12 and 13 aretwo ring-plains called Geminus and Bernouilh, the former being the larger, with a di-ameter of 54 miles. Mes-sala. No. 14, is not so clearlymarked, its roughly circularborder being very irregular;its diameter is about 70miles. Even larger, how-ever, is No. 15, Endymion,one of the most clearlymarked of the walled plainsin the very young great walls are crownedby superb peaks, attaining,in some instances, heightsof 10,000,12,000, and 15,000feet. In following the
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Keywords: ., bookcentury1900, bookdecade19, booksubjectastronomy, bookyear1912
