Distance Modulus 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

t2-017

Effect

Computation or source lookup only

Input and validation requirements

Invalid zero and negative distances reach logarithms outside their real-valued domain; a sign-convention reversal produces a radically different valid-looking distance, and extreme magnitudes could additionally overflow plain arithmetic.

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": {
    "apparent_magnitude_m": 0,
    "absolute_magnitude_M": 0
  },
  "expected_outputs": {
    "distance_modulus": 0,
    "distance_pc": 10,
    "distance_ly": 32.6156
  },
  "working": "m−M = 0−0 = 0.\nd = 10^((0+5)/5) pc = 10^(5/5) pc = 10^1 pc = 10 pc.\n distance_ly = 10 pc × 3.26156 ly/pc = 32.6156 ly."
}

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-tranche2/tranche2-results.json