{
  "checkedAt": "2026-11-10",
  "sampleUTC": "1776-07-04T12:00:00Z",
  "engine": "Astronomy Engine 2.1.19",
  "reference": "NASA/JPL Horizons observer ephemeris, Earth center, quantity 31, apparent ecliptic longitude of date (IAU76/80)",
  "referenceUrl": "https://ssd.jpl.nasa.gov/horizons/",
  "toleranceDegrees": 0.03,
  "comparisons": [
    {
      "body": "Sun",
      "jplLongitude": 102.9184496,
      "engineLongitude": 102.91876030254595,
      "differenceDegrees": 0.00031070254590304103
    },
    {
      "body": "Saturn",
      "jplLongitude": 194.7928346,
      "engineLongitude": 194.7927782170856,
      "differenceDegrees": 0.00005638291440845933
    }
  ],
  "scope": "Two bodies at one sample instant. This is an independent spot check, not validation of every date, body or interpretive claim."
}