Identifier: elementsofastron00lock (find matches)
Title: Elements of astronomy: accompanied with numerous illustrations, a colored representation of the solar, stellar, and nebular spectra, and celestial charts of the northern and the southern hemisphere
Year: 1875 (1870s)
Authors: Lockyer, Norman, Sir, 1836-1920
Subjects: Astronomy
Publisher: New York, D. Appleton and company
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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e heights, it must be re-membered, are much greater as compared with the sizeof the planet than the same elevations would be on theEarths surface, as the Moons diameter is but little morethan one-fourth of the Earths. 230. The Crater Copernicus, one of the most prominentobjects in the Moon, is represented below. The detailsof the crater itself and of its immediate neighborhood re-veal to us unmistakable evidences of volcanic action. Thefloor of the crater is strewn over with rugged masses,while outside the crater-wall (which on the left-hand sidecasts a shadow on the floor, as the drawing was taken to be ? What was once the case with respect to the Moon ? Describe the lunarcraters. 228. What is the best way of seeing how the surface of the Moon isbroken up ? 229. After whom have the crater;moun tains and ranges of the Moonbeen named? How many peaks have been found higher than Mont Blanc?Mention some lunar peaks, and their height. 230. Describe the crater Ooperni- LUNAR CRATERS. 119 If
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0 5 0 10 20 Scale off, ■■?„■■? ^ -? ^j0 Miles. The Lunar Crater Copernicus. soon after sunrise at Copernicus, and the Sun is to the left)many smaller craters are distinctly visible, those near theedge forming a regular line. Enormous unclosed cracksand chasms are also distinguishable. The depth of thecrater-floor, from the top of the wall, is 11,300 feet; andthe height of the wall above the general surface of theMoon is 2,650 feet. The irregularities in the top of thewall are well shown in the shadow. The scale of miles 120 THE MOON. attached to the drawing shows the enormous proportionsof the crater. 231. Walled Plains, and curious markings called Rilles,are interesting features on the Moons surface. Thediameter of the walled plain Schickard, near the south-east limb or edge of the Moon, is 133 miles. Clavius andGrimaldi have diameters of 142 and 138 miles respectively. The rilles, of which 425 are now known, are trencheswith raised sides more or less steep. Besides the ril

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