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Gravity train dynamics in a tunnel through the Earth

Posted 23 days ago

Gravity train dynamics in a tunnel through the Earth

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POSTED BY: Akram Masoud
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As noted in the Wikipedia article, you don't need to pick antipodes. You can drill a straight tunnel between any two arbitrary points and the time needed will be the same. See "Straight path between two arbitrary points".

POSTED BY: Ed Pegg

That’s a great point, Ed — yes, the travel time remains the same for any straight tunnel through the Earth, not only the one passing through the center. I focused on the pole-to-pole case for clarity and symmetry in visualization, but the result indeed holds for all chordal paths between two arbitrary points. Thanks for highlighting this elegant aspect of the problem!

POSTED BY: Akram Masoud

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POSTED BY: EDITORIAL BOARD

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POSTED BY: Akram Masoud
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