{
  "title": "Which radius and gravity: one-way time for four pairs",
  "description": "The uniform-Earth one-way time through the center, pi*sqrt(R/g), for each radius and gravity pair listed on NASA's Earth Fact Sheet: mean radius with mean surface gravity, mean radius with standard gravity, equatorial values and polar values; one row per pair. Retrieved 2026-10-31. License CC BY 4.0 (our calculations; NASA values are public facts).",
  "license": "CC BY 4.0",
  "license_url": "https://creativecommons.org/licenses/by/4.0/",
  "creator": "Puzzles, Charts & Dilemmas",
  "page": "https://puzzleschartsanddilemmas.com/thought-experiments/gravity-train/",
  "derived_from": [
    "NASA NSSDCA, Earth Fact Sheet (last updated 2024-11-15), radii, surface gravity and accelerations, standard acceleration of gravity, https://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html"
  ],
  "method": "Compiled by Puzzles, Charts & Dilemmas from the data listed",
  "data_credit": [
    "NASA Earth Fact Sheet"
  ]
}