Light Travel Time 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

t4-077

Effect

Computation or source lookup only

Input and validation requirements

The specification does not define behavior for negative distances, creating a convention-dependent result: signed arithmetic returns a negative travel time, while physical distance semantics require rejection or magnitude normalization. The extreme finite input also exposes floating-point precision limits, although it does not overflow.

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": {
    "distance": 299792458,
    "distance_unit": "m",
    "c": 299792458,
    "c_unit": "m/s"
  },
  "expected_outputs": {
    "time_s": 1,
    "time_min": 0.0166666666666667
  },
  "working": "t = d/c = 299792458 m ÷ 299792458 m/s = 1 s. Convert to minutes: 1 s ÷ 60 = 0.0166666666666667 min."
}

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-tranche4/tranche4-results.json