A little geometric knowledge would be helpful. There is "curvature" even if you are on an LP record, so unless you know what you are measuring and why, it would tell you nothing.
More to the point is cartography, and the fact that it is not possible to make a continuous map of the Earth unless it is on a spherical surface. All attempts to piece together large flat maps result in boundaries that do not align.
A little geometric knowledge would be helpful. There is "curvature" even if you are on an LP record, so unless you know what you are measuring and why, it would tell you nothing.
More to the point is cartography, and the fact that it is not possible to make a continuous map of the Earth unless it is on a spherical surface. All attempts to piece together large flat maps result in boundaries that do not align.