It can be known only through extensive gravitational measurements and calculations. According to Gauss, who first described it, it is the "mathematical figure of the Earth", a smooth but irregular surface whose shape results from the uneven distribution of mass within and on the surface of Earth. This surface is extended through the continents (such as with very narrow hypothetical canals). ɔɪ d/) is the shape that the ocean surface would take under the influence of the gravity of Earth, including gravitational attraction and Earth's rotation, if other influences such as winds and tides were absent.
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