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circle of equal altitude

The significance of the circle of equal altitude is:
The definition of circle of equal altitude is:

. A circle on the surface of the earth, on every point of which the altitude of a given celestial body is the same at a given instant. The center of this circle is the geographical position of the body, and the great great circle distance from this pole to the circle is the zenith distance of the body. See PARALLEL OF ALTITUDE.


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