Why the world has no single geographical centre, despite centuries of scientific debate

History · Published 20 October 2026 · Updated 21 October 2026 Swipe more like this →

In short: Finding the exact middle of the Earth is not a simple task of geometry. Because there is no universally accepted definition of a geographic centre, scientists and cartographers produce wildly different results depending on their chosen methodology, map projection, and whether they decide to include Antarctic ice in their calculations.

The study of these central points, known as centrography, dates back to 1872 with the work of Julius Erasmus Hilgard. By the 1930s, it had evolved into a complex field merging cartography with statistical analysis. Despite this history, the United States Geological Survey maintains that there is no generally agreed-upon definition or completely satisfying method for determining a geographic centre. The challenge stems from the uneven distribution of Earth's landmasses and the difficulty of accounting for the planet's curvature.

Different approaches yield vastly different coordinates. One common method involves finding the centroid of area—the point upon which a shape would balance if cut from a uniform plane. Others use the centre of gravity or the median point, which seeks the location where the sum of distances to all land points is minimized. In 1944, calculations placed the median point of Earth's land in Tarnopol, Ukraine, or İzmir, Turkey, depending on the inclusion of Antarctic sea ice. Meanwhile, the centre of gravity method has pointed toward the vicinity of Balchik, Bulgaria.

Historically, the search for a centre has been as much about culture as it has been about science. Ancient civilizations identified various 'axis mundi' or world centres, such as Delphi, Jerusalem, and the Great Pyramid of Giza. In 1864, Charles Piazzi Smyth argued that the Great Pyramid should define the prime meridian because it sat at the centre of all habitable land. However, an expert committee ultimately chose Greenwich, largely because of the practical necessity of serving the high volume of ships using the port of London.

Today, the debate continues through modern iterative processes and refined projections, such as those used by New Zealand's GNS Science in 2019. Whether calculating the centre of a nation or the entire planet, the result remains sensitive to the chosen methodology, the treatment of islands and water, and the specific map projection employed. As a result, the 'true' centre of the world remains a moving target, defined more by the parameters of the researcher than by any immutable physical reality.

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