Spherical Trigonometry: for Colleges And Secondary Schools
Spherical Trigonometry: for Colleges And Secondary Schools
Daniel a Daniel Alexander Murray
The book Spherical Trigonometry: for Colleges And Secondary Schools was written by author Daniel a Daniel Alexander Murray Here you can read free online of Spherical Trigonometry: for Colleges And Secondary Schools book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Spherical Trigonometry: for Colleges And Secondary Schools a good or bad book?
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In an analogous manner the positions of bodies on the celestial sphere are described by means of, or by reference to, certain points and great circles on that sphere. There are four different systems of circles of reference. As in the case of the terrestrial sphere, each system consists of two circles, each of which passes through the pole of the other, and, accordingly, is at right angles to the other. Two of these systems are described in Arts. 70, 71, a third in Art. 76, and the fourth in Ar...t. 77. A point which will be referred to in these systems is the north celestial pole. This is the point where the earth's axis, if prolonged, would pierce the celestial sphere. It is near the pole star, being about 1\^ from it. **'... imagine the entire solar system as represented by a tiny circle the size of the dot over this letter i.'* (Neptune the outermost planet known of the solar system is 2790 millions of miles from the sun ; i.e. 30 times as far as the earth.) " Even the sun itself, on this exceedingly reduced scale, could not be detected with the most powerful microscope ever made.
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