4 ms·

Yeah i read that and I immediately thought BS. The most the tide varies on earth is less 15 meters.

• blincoln 3y ago
  It's in relation to a theoretical ellipsoid shape. "The geoid can be as low as 106 meters (350 feet) below the ellipsoid or as high as 85 meters (280 feet) above."[1] [1] https://www2.csr.utexas.edu/grace/gravity/gravity_definition.html https://www2.csr.utexas.edu/grace/gravity/gravity_definition...
  • waynecochran 3y ago
    Yes. The polar and equatorial diameter of the the earth differ by over 20 miles, but along a latitude line the earth is quite circular.
    • Linosaurus 3y ago
      > quite circular In this case it’s 106m away from a perfect circle. Almost nothing compared to 20km, but a real thing.