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The Great Marathons

How these connect

The marathon distance (42.195 km / 26 miles 385 yards) and what it relates to. Every line is an evidence-backed relation, and the arrangement is fixed — this address draws this picture, today and next year.

concerns — The 1921 IAAF Congress adopted 26 miles 385 yards as the universal marathon distance.affects — Times over the fixed distance fell sharply and simultaneously across every fast course after the shoes appeared, so performances either side of the change are not directly comparable.constrained_by — The 2020 rules cap midsole thickness at 40 mm, permit only one rigid plate and forbid prototypes.depends_on — A declared distance is only meaningful if every course can be certified against it, which the calibrated bicycle method exists to do.derived_from — The standard distance is the measured length of the 1908 London Olympic course, adopted as it stood.governs — The federation fixed the distance in 1921 and remains the only body that could change it.The 1908 Olympic marathon fixes 26 miles 385 yardsThe 1908 Olympic marathon…The 1908 distance becomes the world standardThe 1908 distance becomes…World AthleticsWorld AthleticsThe marathon distance (42.195 km / 26 miles 385 yards)The marathon distance (42…Calibrated bicycle course measurementCalibrated bicycle course…Carbon-plated road racing shoeCarbon-plated road racing…
6 drawn · 6 reachable and not drawn · positions derived from object ids, never from a simulation
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Every relation drawn, in words6
  1. The 1908 distance becomes the world standard · concerns · The marathon distance (42.195 km / 26 miles 385 yards)

    The 1921 IAAF Congress adopted 26 miles 385 yards as the universal marathon distance.

  2. Carbon-plated road racing shoe · affects · The marathon distance (42.195 km / 26 miles 385 yards)

    Times over the fixed distance fell sharply and simultaneously across every fast course after the shoes appeared, so performances either side of the change are not directly comparable.

  3. Carbon-plated road racing shoe · constrained_by · World Athletics

    The 2020 rules cap midsole thickness at 40 mm, permit only one rigid plate and forbid prototypes.

  4. The marathon distance (42.195 km / 26 miles 385 yards) · depends_on · Calibrated bicycle course measurement

    A declared distance is only meaningful if every course can be certified against it, which the calibrated bicycle method exists to do.

  5. The marathon distance (42.195 km / 26 miles 385 yards) · derived_from · The 1908 Olympic marathon fixes 26 miles 385 yards

    The standard distance is the measured length of the 1908 London Olympic course, adopted as it stood.

  6. World Athletics · governs · The marathon distance (42.195 km / 26 miles 385 yards)

    The federation fixed the distance in 1921 and remains the only body that could change it.