Stellar Parallax Distance 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

t2-029

Effect

Computation or source lookup only

Input and validation requirements

The instrument breaks or becomes hazardous at zero parallax because division is undefined, at very large parallax because the small-angle formula diverges from the finite-angle geometric result, and for negative parallax because signed arithmetic produces an unphysical negative distance unless the input is rejected or specially interpreted.

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": {
    "parallax": 0.1,
    "parallax_unit": "arcsec"
  },
  "expected_outputs": {
    "distance_pc": 10,
    "distance_ly": 32.6156,
    "distance_AU": 2062648.06247
  },
  "working": "1) d(pc)=1/0.1=10 pc. 2) d(ly)=10×3.26156=32.6156 ly. 3) d(AU)=10×206264.806247=2062648.06247 AU."
}

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