Solar Elevation Shadow-Length Calculator 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

t5-182

Effect

Computation or source lookup only

Input and validation requirements

The specification does not state validation for zero elevation, elevations beyond the physical solar domain, or below-horizon sign handling. Direct arithmetic can yield Infinity at 0° and a negative or physically meaningless shadow for invalid or convention-dependent angles.

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": {
    "object_height": 1.8,
    "height_unit": "m",
    "sun_elevation": 45,
    "angle_unit": "degrees"
  },
  "expected_outputs": {
    "shadow_length": 1.8,
    "unit": "m"
  },
  "working": "tan(45°) = 1. shadow = 1.8 m / 1 = 1.8 m."
}

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