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Nautical Science in Its Relation to Practical Navigation; Together with a Study of the Tides and Tidal Currents

Nautical Science in Its Relation to Practical Navigation; Together with a Study of the Tides and Tidal Currents


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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: Nautical Science CHAPTER I THE EARTH AS AN ASTRONOMICAL BODY TWO thousand years ago were the words written, If at sea we sail towards mountains or other high objects, we see these objects rise from the sea, where they have been concealed hitherto by the curvature of the surface of the water. Other and even better proofs of the spherical shape of the earth were given by the astronomers of old. They knew that the earth and moon are opaque bodies, that the moon shines by the reflected light of the sun, and that a lunar eclipse is caused by the moon passing into the shadow cast by the earth. Now they noticed that the outline of the earth's shadow, thus cast upon the moon, was always a smooth curve, the arc of a circle; and they knew that a sphere is the only body that always casts a circular shadow. A flat disc, a hemisphere, or anirregularly shaped body may, when placed in some special position, cast a circular shadow: but let another side of such a body be turned toward the light and the shadow will show straight lines and sharp, irregular edges. Thus from prehistoric times it was well known that the earth is a globe. The popular idea that Columbus discovered this fact, and that it was this discovery which led to his voyage to America, is utterly wrong. At the time of Columbus it was only the unlearned and the intentionally ignorant who did not know that the earth is spherical. In fact the earth was measured some seventeen centuries before Columbus was born. Eratosthenes, about the year 200 B.c., measured the circumference of the earth and found it to be about 250,000 stadia, or some 30,000 English miles. This is some twenty per cent, too great, for according to the latest measures, the equatorial circumference of the earth is slightly less than 25,000 miles. In mak...


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Product Details
  • ISBN-13: 9780217730648
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 70
  • Spine Width: 4 mm
  • Width: 189 mm
  • ISBN-10: 0217730647
  • Publisher Date: 04 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 141 gr


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