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World circumnavigation


A basic definition of a world circumnavigation would be a route which covers at least a Great Circle , and in particular one which passes through at least one pair of points Antipodal to each other. In practice, different definitions of world circumnavigation are used, in order to accommodate practical constraints depending on the method of circumnavigation.


Sailing

The map on the right shows, in red, a typical Sailing circumnavigation of the world by the Trade Wind s and the Suez and Panama canals; overlaid in yellow are the points antipodal to all points on the route. It can be seen that the route roughly approximates a great circle, and passes through two pairs of antipodal points. This is a route followed by many Cruising sailors; the use of the trade winds makes it a relatively easy sail, although it passes through a number of zones of calms or light winds.

In round-the-world race in red; overlaid in yellow are the points antipodal to all points on the route. It can be seen that the route does not pass through any pairs of antipodal points.


Aviation

Aviation records take account of the wind circulation patterns of the world; in particular the Jet Stream s, which circulate in the northern and southern hemispheres without crossing the equator. There is therefore no requirement to cross the equator, or to pass through two antipodal points, in the course of setting a round-the-world aviation record. Thus, for example, Steve Fosset 's global circumnavigation by balloon was entirely contained within the southern hemisphere.

For powered aviation, the course of a round-the-world record must start and finish at the same point and cross all meridians; the course must be at least 36,787.559  Kilometre s (22,858.729  Mi ) long (which is the length of the Tropic Of Cancer ). The course must include set control points at latitudes outside the Arctic and Antarctic circles. ''FAI Sporting Code Section 2: Powered Aerodynes: Speed around the world non-stop and non-refuelled''

In ballooning, which is totally at the mercy of the winds, the requirements are even more relaxed. The course must cross all meridians, and must include a set of checkpoints which are all outside of two circles, chosen by the pilot, having radii of 3,335.85  Kilometre s (2,072.80  Mi ) and enclosing the poles (though not necessarily centred on them). ''FAI Sporting Code Section 1: Aerostats: Around-the-World Records''


Notable global maritime circumnavigations




Other notable maritime circumnavigations



Record maritime circumnavigations



Notable aerial circumnavigations




External links



References