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The Essence of Astronomy; Things Every One Should Know about the Sun, Moon, and Stars

The Essence of Astronomy; Things Every One Should Know about the Sun, Moon, and Stars


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About the Book

Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: CHAPTER III MERCURY Mercury is the smallest of the bodies called planets, and revolves nearer to the Sun than any of the others. Its diameter is about 3030 miles, nearly half as much again as that of our Moon. Its surface is about one seventh that of the Earth, and its volume about one eighteenth. Its mean, or average, distance from the Sun is 36,000,000 miles. Its elliptical orbit is more eccentric, or elongated, than those of the other planets, and its distance from the Sun varies between 43,500,000 miles and 28,500,000 miles. Its distance from the Earth at its closest approach is about 50,000,000 miles, and when farthest from it, about 136,000,000 miles. Mercury revolves around the Sun in very nearly 88 days. This is the year of Mercury. It rotates upon its axis in the same time, 88 days, and in consequence always turns the same side toward the Sun, this side being in perpetual daylight, the other in perpetual night. Its axis is perpendicular to the plane of its orbit about the Sun. There are upon Mercury, therefore, no seasons such as we experience on the Earth. It moves in its path of revolution at a mean speed of about 29 miles per second. This speed varies, however, between about 36 miles per second, when nearest the Sun, and about 23 miles per second, when farthest away. The mass of Mercury is not definitely known. According to the latest measurements, the density of the planet is somewhat less than that of the Earth. The weight of Mercury is, therefore, slightly less than five and one half times that of a globe of water the same size. If these estimates are correct, as seems probable, its attraction for bodies at its surface is about one half that of the Earth's. That is, a body weighing 200 pounds here would weigh less than 100 pounds ther...


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Product Details
  • ISBN-13: 9780217799348
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 40
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 0217799345
  • Publisher Date: 10 Jan 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 91 gr


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