Bulatan agung: Perbezaan antara semakan
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Mengatakan secara had [[reference ellipsoid|bukan sebuah sfera sempurna]] Bumi (ia sebuah sferoid buntal atau ellipsoid – i.e., slightly squashed at the poles), yang bermakna bahawa jarak terpendek di antara dua titik (sebuah geodesic) adalah agak bukan sebuah lingkaran besar. Sunggpuhpun, model sfera dapat dianggap suatu penganggaran pertama.
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If one were to travel along a great circle, it would be difficult to steer manually as the heading would constantly be changing (except in the case of due north, south, or along the equator). Thus, Great Circle routes are often broken into a series of shorter [[rhumb line]]s which allow the use of constant headings between [[waypoint]]s along the Great Circle.
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==Lihat juga==
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* [http://demonstrations.wolfram.com/GreatCirclesOnMercatorsChart/ Great Circles on Mercator's Chart] by John Snyder with additional contributions by Jeff Bryant, Pratik Desai, and Carl Woll, [[Wolfram Demonstrations Project]].
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