Sundog · Atlas math binding
Phase 3 Test Harness
Assertion-style tests of the phase3 namespace exported from
public/js/parhelion-geometry.mjs. The tests pin the
altitude-bound formulas — parhelion offset, CZA visibility cutoff,
altitude-derived parhelic curvature — to reference altitudes from the
multi-photo calibration pass. Failing rows surface as red and mean the
altitude bindings have drifted from what the calibration evidence
recorded.
running…
parhelion / dagger offset
phase3.daggerOffset(h) = R₂₂ / cos(h). Validated across 0°–60°; the formula is the load-bearing claim of the inverse-inference theorem anchor.
| h (°) | expected (px) | actual (px) | |Δ| | verdict |
|---|
CZA visibility
phase3.czaVisible(h) = (h ≤ 32°). Atmospheric-optics rule: the circumzenithal arc exits the visible hemisphere when the sun rises above ~32°.
| h (°) | expected | actual | verdict |
|---|
parhelic curvature (altitude-derived)
phase3.parhelicCurvature(h) preserves the 25° Phase 2 calibration at c=0.05, then grows for high-sun displays; checked at key altitudes.
| h (°) | expected | actual | |Δ| | verdict |
|---|
structural invariants
Whole-model relationships that must hold regardless of altitude — checked for one-off regressions.