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Use a geoid. A geoid is, to quote Wikipedia the shape that the surface of the oceans would take under the influence of Earth's gravitation and rotation alone, in the absence of other influence...
#1: Attribution notice removed
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System
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2020-06-01T14:13:48Z (almost 5 years ago)
Source: https://worldbuilding.stackexchange.com/a/36508 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/