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

=== Yes — narrow emission lines (including plasma lines) are a plausible mechanism for shifting a geometry-based angle a few tenths of a degree. The mechanism is simple: dispersion makes θ depend on λ, and narrow spectral peaks weight the average more strongly at particular λ. The ~0.47° offset is small enough that a reasonable combination of lines/continuum can produce it. Numerics with real n(λ) data will tell us whether the required line strengths are physically reasonable. ===

If you want, I’ll proceed now with the numerical run (fetch refractiveindex.info Hale & Querry data and compute). Tell me:
• Do we test water (rainbow/raindrop) geometry first?
• Which spectral lines to include (I can pick: Hα 656.28 nm, Hβ 486.13 nm, Na D doublet 589.0/589.6 nm, plus a basic plasma line set), and which Planck temperatures (e.g. 3000 K, 5800 K)?

I’ll then run the calculation, plot θ(λ), and show how the weighted mean shifts — with citations to the refractive index source.