Einstein might have been a con-artist but the math apparatus developed by his controllers to once again fool the masses, was still impressive and the deduction of Einstein’s Field Equations actually includes a method to learn the curvature of a surface. The method, which is explained in this video, is based on parallel-translation of a vector around a curve of the surface examined.

https://youtu.be/foRPKAKZWx8?t=4353 I recommend watching from start if you are not already familiar with tensor …