| 21. | The gnomonic projection is used for charts intended for plotting of great circle routes.
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| 22. | The birds are doing the right thing if they are following a great circle,
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| 23. | That great circle divides the traditional western and eastern hemispheres.
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| 24. | When limited to small seas, planispheres approximately follow both rhumb lines and great circles.
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| 25. | The two points separate the great circle into two arcs.
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| 26. | Also, lines in the planar model are projections of great circles of the sphere.
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| 27. | The main feature of the gathering was said to be a great circle dance.
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| 28. | On a great circle, the bearing to the destination point does not remain constant.
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| 29. | In spherical trigonometry, angles are defined between great circles.
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| 30. | 2003-Current-Chairman of the Board of Directors, Great Circle Books.
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