Geologic Strain/Dip-Strike Helper 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

t5-090

Effect

Computation or source lookup only

Input and validation requirements

The exact input combination apparent dip 30° and section-strike angle 90° makes the inversion denominator cos(90°) equal to zero, so the true dip is undefined and the instrument must reject the input rather than return a finite number.

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_dip_deg": 0,
    "angle_section_to_strike_deg": 45
  },
  "expected_outputs": {
    "true_dip_deg": 0
  },
  "working": "tan(0°) = 0; sin(45°) = 0.70710678; tan(true dip) = 0 / 0.70710678 = 0; true dip = atan(0) = 0°."
}

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-tranche5/tranche5-results.json