Question
Explain the horizon coordinate system with the help of a diagram.
Answer :
Word Count : 284
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The horizon is defined as the dividing line between the Earth and the sky, as seen by an observer on the ground. In the horizon coordinate system the astronomical horizon is the hypothetical interface between Earth and sky, as would be seen by the observer if the surrounding terrain were perfectly flat (as out on a calm ocean).
Referring to the drawing below, zenith is the point straight overhead, perpendicular to the horizon plane, and nadir is the point directly under the observer. A vertical circle through an object in the sky and the zenith is the object circle. The coordinates of the object are given by the
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