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llr

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A desktop Tkinter analysis tool for **Lunar Laser Ranging (LLR)** normal-point data. Fits the secular Earth–Moon recession (3.82 cm/yr), removes geometric variations (synodic + 18.6-year nodal), and derives a residual-RMS-based bound on the gravitational **Equivalence Principle** parameter |Δa/a| — currently 3 × 10⁻¹⁴ from APOLLO-era data.

  • Updated May 19, 2026
  • Python

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