The gravity tunnel in a non-uniform Earth

@article{Klotz2015TheGT,
  title={The gravity tunnel in a non-uniform Earth},
  author={Alexander R. Klotz},
  journal={American Journal of Physics},
  year={2015},
  volume={83},
  pages={231-237}
}
This paper examines the gravity tunnel using the internal structure of Earth as ascertained from seismic data. Numerically, it is found that the time taken to fall along the diameter is 38 min, compared to 42 min for a planet with uniform density. The time taken to fall along a straight line between any two points is no longer independent of distance but interpolates between 42 min for short trips and 38 min for long trips. The brachistochrone path (minimizing the time between any two points… 
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