Assertion: reference ellipsoid | /r/SimilarTo | the one
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text: In fact, the latitude and longitude coordinates that plot a position on an ellipsoid's surface are part of a geodetic datum, the values of which are determined by the defining reference ellipsoid model used (thus a given spot plotted will have varying coordinate values——the variance depending on the reference ellipsoids' difference, sometimes up to hundreds of meters, though usually less than a few——meaning, to find the theoretically precise distance between two points, the reference ellipsoid used must either be the same as the one the coordinates' datum is based on, or a reconciling adjustment made to X, Y, Z in the calculations).