Astrophotography FITS Star-Elongation Backfocus Spacer Thickness Solver

Deterministic 2D elliptical Moffat PSF fitting across 3×3 grid + radial vs tangential semi-major axis vector projection (r̂ · ê) vs f-ratio Petzval slope engine (.fits, .fit, .xisf, .dng) built for ZWO ASI, William Optics, Takahashi, PixInsight — zero-upload ephemeral Wasm RAM execution.

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