Circle of Equal Altitude (LOP) is

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Circle of Equal Altitude (LOP) is

The Circle of Equal Altitude is the set of all positions on the Earth from which the celestial body would be seen at the same observed altitude. This locus forms a circle on the Earth's surface with its center at the body's geographic position (the subpoint of the body). The radius of that circle is the zenith distance, which is 90 degrees minus the observed altitude. Since 1 degree of arc on the Earth equals 60 nautical miles, the radius in nautical miles is zenith distance times 60. So the most accurate description is a circular LOP centered on the celestial body's geographic position, with radius equal to the zenith distance.

The Circle of Equal Altitude is the set of all positions on the Earth from which the celestial body would be seen at the same observed altitude. This locus forms a circle on the Earth's surface with its center at the body's geographic position (the subpoint of the body). The radius of that circle is the zenith distance, which is 90 degrees minus the observed altitude. Since 1 degree of arc on the Earth equals 60 nautical miles, the radius in nautical miles is zenith distance times 60. So the most accurate description is a circular LOP centered on the celestial body's geographic position, with radius equal to the zenith distance.

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