{
  "methodVersion": "1.0",
  "resourceRelease": "269",
  "activity": "https://darksciencedocs.com/scale-lab/#horizon-teaching",
  "sourceReviewDate": "2026-10-25",
  "provenance": "Four generated Schwarzschild comparisons from adopted nominal-solar masses. The 10/20 cases are hypothetical; Sgr A*/M87* inputs are rounded literature comparisons, not new mass or horizon measurements.",
  "constants": {
    "speedOfLightMS": 299792458,
    "nominalSolarGmM3S2": 1.3271244e+20,
    "auKm": 149597870.7,
    "kmPerInternationalMile": 1.609344,
    "radiusKmPerNominalSolarMass": 2.95325007610025,
    "diameterKmPerNominalSolarMass": 5.9065001522005
  },
  "cases": [
    {
      "case": "1",
      "name": "stellar-10",
      "massNominalSolar": 10,
      "massStatus": "hypothetical",
      "radiusKm": 29.5325007610025,
      "diameterKm": 59.065001522005,
      "radiusMiles": 18.350645207614093,
      "diameterMiles": 36.701290415228186,
      "diameterAu": 3.9482514855076075e-07,
      "diameterRatioToCase1": 1.0,
      "recoveredMassNominalSolar": 10.000000000000002
    },
    {
      "case": "2",
      "name": "stellar-20",
      "massNominalSolar": 20,
      "massStatus": "hypothetical",
      "radiusKm": 59.065001522005,
      "diameterKm": 118.13000304401,
      "radiusMiles": 36.701290415228186,
      "diameterMiles": 73.40258083045637,
      "diameterAu": 7.896502971015215e-07,
      "diameterRatioToCase1": 2.0,
      "recoveredMassNominalSolar": 20.000000000000004
    },
    {
      "case": "3",
      "name": "sagittarius-a",
      "massNominalSolar": 4000000,
      "massStatus": "rounded_comparison",
      "radiusKm": 11813000.304400997,
      "diameterKm": 23626000.608801994,
      "radiusMiles": 7340258.083045636,
      "diameterMiles": 14680516.166091273,
      "diameterAu": 0.15793005942030428,
      "diameterRatioToCase1": 400000.0,
      "recoveredMassNominalSolar": 3999999.9999999995
    },
    {
      "case": "4",
      "name": "m87",
      "massNominalSolar": 6500000000,
      "massStatus": "rounded_comparison",
      "radiusKm": 19196125494.651627,
      "diameterKm": 38392250989.30325,
      "radiusMiles": 11927919384.949163,
      "diameterMiles": 23855838769.898327,
      "diameterAu": 256.63634655799456,
      "diameterRatioToCase1": 650000000.0,
      "recoveredMassNominalSolar": 6500000000.000001
    }
  ],
  "comparisons": {
    "doublingMassDiameterFactor": 2,
    "doublingMassAreaFactor": 4,
    "sagittariusToStellar10": 400000,
    "m87ToSagittarius": 1625,
    "inverseFromRoundedDiameter118_130Km": 19.999999484633893
  },
  "checks": {
    "referenceSha256": "bfbd07597a38924773d66495cebff1af8985f360b3b219ddb77293d1ef8e343e",
    "generatedCasesSha256": "7d99a011e4fd0f4137b8239cae812556a138454fcba2f494790f665274109ed2",
    "radiusDiameterUnitsRatiosAndInverseAgree": true
  },
  "limits": "Isolated nonrotating uncharged Schwarzschild model. Radius is areal/circumferential; D=2r_s is a size convention, not a ruler measurement through the interior. No spin, accretion-flow image, ray trace, observed shadow, mass inference, tidal survival or detection calculation. Exact nominal conversions do not remove uncertainty from adopted rounded masses. Stored digits support arithmetic, not measurement precision. No independent scientific review or formal curriculum alignment claimed."
}