DCML Digest, Vol 13, Issue 26 "AW: analytical solution to center of earth problem"

[Pascal Oost]

A word of advice to all diggers:
to avoid bruises while falling through the center of the Earth, a straight
tunnel will not do. Because of the Earth's rotation, a Duck falling through
it will follow a Spirography-kind of orbit around the Earth's center. Which
requires more calculations and a lot more digging.

P