Plate Motion Rate & Distance Projector implementation

Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

Record owner

Guth Instruments

Lifecycle

verified-clean

Evidence ID

t7-096

Effect

Computation or source lookup only

Input and validation requirements

The inverse time operation is undefined for zero rate and must reject distance=100 cm with rate=0 cm/yr. A second hazard is the unclarified treatment of negative custom rates, which can produce either signed displacement or an invalid input depending on the UI convention.

Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

{
  "inputs": {
    "operation": "distance",
    "rate": 1,
    "rate_unit": "cm/yr",
    "time": 365.25,
    "time_unit": "Julian years",
    "plate": "custom"
  },
  "expected_outputs": {
    "distance_cm": 365.25,
    "distance_m": 3.6525,
    "distance_km": 0.0036525
  },
  "reference_data": {
    "custom_rate_cm_per_year": 1,
    "source_convention": "User-specified custom rate; 1 cm/yr is a realistic slow plate-motion magnitude",
    "julian_year_days": 365.25,
    "julian_year_source_convention": "IAU standard Julian year, exact convention",
    "centimeters_per_meter": 100,
    "kilometers_to_centimeters": 100000,
    "length_conversion_source_convention": "SI decimal-prefix definitions, exact"
  },
  "working": "d = rate × time = 1.0 cm/yr × 365.25 yr = 365.25 cm. Convert to meters: 365.25 cm ÷ 100 cm/m = 3.6525 m. Convert to kilometers: 3.6525 m ÷ 1000 m/km = 0.0036525 km. The 365.25-day Julian-year table entry is exact, although the calculation cancels the year unit directly."
}

Other records

Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

• VERIFIED_LEDGER.json
• evidence-tranche7/tranche7-results.json