circle of position
- A small circle on the globe (earth) in which, at every point at the instant of observation, the observed celestial body (sun, star, or planet) has the same altitude and, therefore, the same zenith distance. Also called a circle of equal altitude.
Aviation dictionary. 2014.
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circle of position — navigation : a circle on the earth whose center is the point directly under a celestial body and whose radius is the zenith distance of the celestial body, the observer s location being somewhere on this circle compare sumner line * * * circle of … Useful english dictionary
circle altitude — A circle on the earth’s surface centered on the line joining the center of the earth to a heavenly body, from which the altitude of the body is everywhere equal. Also called a circle of position and a circle of equal altitude … Aviation dictionary
circle of equal altitude — A circle on the surface of the earth, having as its center the substellar points of a given celestial body, from any point on or above the circumference of which the angular altitude of the body is the same. Also called a circle of position … Aviation dictionary
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