The furthestmost point away from any place on our approximately 25-thousand-mile-circumferenced Earth sphere is always halfway around the world, which is 12,500 great-circle miles away in any direction from the point at which we start. Flying the shortest distance from the exact North Pole to the South Pole, any direction you first head in will be "due south." If you keep on heading exactly south you will find yourself following a one-great-circle meridian of longitude until you get to the South Pole. Furthermore, to reach your halfway-around-the-Earth, furthest-away-from-you point which is always 12,500 miles away -- flying in a Concorde supersonic transport, cruising efficiently at Mach 2 (approximately 1,400 m.p.h.), and including stopover refueling times, you will reach that furthestmost halfway-around-the-world-from-where-you-started point in half a day.

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