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Because of Sun/SSB wobble, can't use slope solver to find Neptune apsides. Added special case logic to find them using more of a brute force algorithm. Unit tests now pass, but require very loose tolerances for the outer planets. I will have to adjust the model generator to create more accurate heliocentric distance models for the VSOP planets, and more accurate Chebyshev polynomials for Pluto. This will be a judgment call to balance accuracy versus code size.