great circle


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Related to great circle: Great circle route, Great circle sailing, Great circle distance

great circle

Geometry a circular section of a sphere that has a radius equal to that of the sphere

great circle

The circular intersection on the surface of a sphere of any plane passing through the center of the sphere. A sphere and its great circles are thus concentric and of equal radius. Compare small circle.

Great Circle

(religion, spiritualism, and occult)

A great circle is any circle drawn on a sphere, the plane of which also passes through the inside of the sphere. Great circles are the basis of various systems for locating terrestrial and celestial bodies in terms of sets of coordinates expressed in degrees of a circle. Longitude and latitude are the most familiar of these coordinates. Astrology utilizes several systems of celestial coordinates. Parallel to the manner in which terrestrial coordinates are great circles drawn on the surface of Earth, celestial coordinates are great circles drawn on the inside of the celestial sphere. The ecliptic, the celestial equator, and the prime vertical are examples of some of the great circles used in astrology.

great circle

[′grāt ¦sər·kəl]
(geodesy)
A circle, or near circle, described on the earth's surface by a plane passing through the center of the earth.
(mathematics)
The circle on the two-sphere produced by a plane passing through the center of the sphere.

great circle

great circle
Two great circle in a sphere.
A circle on the surface of the sphere (earth) whose center and radii are those of the sphere itself. Only one great circle may be drawn through two places that are not diametrically opposite on the surface of a sphere. The shortest distance between any two points on the surface is the smaller arc of the great circle joining them. An aircraft following a great circle (other than directly true north or south) will have to alter course constantly. The intersection of a sphere and a plane that does not pass through its center is called a small circle.
References in periodicals archive ?
Thousands of Great Circle life rafts are an important safety feature on vessels right around our coastline," he says.
This article focuses on the countries located in the great circle and their relations with the global powers.
The stone-dressing work on the monument's great circle (both uprights and lintels) was accomplished by working parallel to the long sides of the stones, while the five stone 'trilithons' (the great horse-shoe arrangement of linteled stones) within the great circle were dressed by working at right-angles to the sides of the stones.
fly it some Great Circle Route back to the cupboards, bare of memories?
Aircraft routes approximate to great circles because an arc of a great circle is the shortest distance between two points on the sphere.
Advising STS Logistics Corporation in connection with its $100 million merger with Overseas Logistics Service Corporation, two portfolio companies of Great Circle Fund in which Alfa Capital Partners is a co-manager.
Which is the only great circle in the world that can be either terrestrial or celestial?
For the same eastern portion of the array our analyses show that for earthquakes originating from the north, the resolved back azimuths deviate to the west of the great circle back azimuths.
A "straight line" in an elliptic plane is an arc of great circle on the sphere.
The Earthworks are made up of three areas covering four square miles--the Great Circle, the Octagon and Wright Earthworks connected by sets of parallel-walled avenues.
A Guide to Planning and Cruising The Great Circle Route Around the Eastern USA, 2nd Edition G.