The Young Folks Astronomy

The Young Folks Astronomy

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1886 edition. Excerpt: ...side of you will ever be toward the table. Now call yourself the moon and the table the earth, and you will easily understand how the moon can turn on its axis once while going round the earth once, and why it is that we never see but one side of it. For certain reasons, which will not now be explained, we really see a little more than half of the moon's surface, so that only about three sevenths of it is hidden from us. The moon has therefore two motions: first, a motion round the earth, in which it presents to us its different phases, passing from new moon to full moon and back to new moon again in about twenty-nine and a half days; second, a motion round its axis, turning round once in just the same time. As the spinning round of the earth on its axis makes day and night on the earth, so the turning of the moon makes day and night in the moon; but while our day is only twenty-four hours long, the moon day lasts a month, each day and each night being nearly fifteen of our days in length. During the long day, with the sun always shining, the heat must be very great; and during the long night, when no sun warms it, the cold must be terrible. There is no twilight there before sunrise and after sunset, as on the earth, but day begins and night comes on almost at once. RECITATION FOR LESSON XVII. How does the moon look through a telescope? Its surface is seen to be covered with mountains, valleys, and plains. What were its plains once thought to be? They were thought to be seas, and they are still called seas on maps of the moon, though they are now known to be only dry land. Is there no water on the moon? None can be seen by us, and no atmosphere or layer of air has been found around it. What follows from this? That there can be no clouds, ...
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Product details

  • Paperback | 38 pages
  • 189 x 246 x 2mm | 86g
  • United States
  • English
  • black & white illustrations
  • 1236850157
  • 9781236850157