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abstraction > mathematical concept > geometrical object > conic section > ellipse > circle > great circle > meridian |
meridian comparison table |
Subject | is a kind of | has definition |
---|---|---|
great circle | circle | A circle on the surface sphere whose diameter equal to the diameter of the sphere. |
meridian | great circle | A great circle passing through the celestial poles and through the zenith of any location on Earth. For planetary observations a meridian is half the great circle passing through the planet's poles and through any location on the planet. |
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