![]() ![]() 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) .It is based on the position of stars relative to an observer's ideal horizon. 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) . The positioning of a celestial object by the horizontal system varies with time, but is a useful coordinate system for locating and tracking objects for observers on Earth.1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) . Celestial navigation, also known as astronavigation, is the practice of position fixing using stars and other celestial bodies that enables a navigator to accurately determine their actual current physical position in space (or on the surface of the Earth) without having to rely solely on estimated positional calculations, commonly known as 'dea. ![]() Smart: Textbook on Spherical Astronomy (6th ed.) . The celestial horizon is also known just as the horizon, and as such is used in common parlance to mean as far as can be seen, figuratively as well as literally. : an imaginary sphere of infinite radius against which the celestial bodies appear to be projected and of which the apparent dome of the visible sky forms half Example Sentences Recent Examples on the Web This pairing hums with a soft energy, attuned perhaps to the same celestial spheres that Gouverneur hoped to crack open. The poles of the celestial horizon are known as the zenith and the nadir. It is the great circle on the celestial sphere midway between the observers zenith and nadir it divides the celestial sphere into two equal hemispheres. The sky resembles one-half of a sphere or dome centered at. ![]() The rest of it is hidden by Earth itself. Horizon: Wherever one is located on or near the Earths surface, the Earth is perceived as essentially flat and, therefore, as a plane. Thus the celestial horizon is the edge of the visible part of the celestial sphere. The celestial horizon is the great circle on the celestial sphere whose plane is perpendicular to the line from the zenith to the observer. ![]()
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