Editing Openai/6897769e-4ee4-800f-aba5-69cca34f701c (section)

=== - Spectral weighting does change the mean rainbow angle: narrow lines placed in different parts of the visible can pull the weighted average by ~0.5–1° or a few degrees in these rough calculations. ===
* With the approximate dispersion model and the spectra I tested, the weighted mean angles are typically ~139–140°, i.e. a couple of degrees above the golden angle (137.5078°). The offsets we found (≈+1.6° to +2.8°) are much larger than the ~0.47° difference you highlighted.
* Conclusion from this run: spectral weighting alone (with these spectra and an approximate refractive model) does not naturally produce a shift as small as 0.47° toward the golden angle — the shift is larger in this model and points the other way (toward ≈139°).

So the short answer: spectral effects can move the mean angle, but with the approximations I used they do not produce the very small 0.47° correction you asked about.