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  • #869
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Created Dec 06, 2021 by Evan Ward@evanward1Developer

Brouwer-Lyddane Critical Inclination Fix

I saw that the Brouwer-Lyddane model was added in #653 (closed) and it is not applicable for critical inclinations. Warren Phipps' 1992 thesis at [1] documents a fix for the critical inclination problem. It does change the behavior of the propagator near the critical inclination so perhaps it is worthwhile to keep the original Brouwer-Lyddane model as well as one closer to the PPT2 model which is applicable for all near Earth orbits.

[1] https://apps.dtic.mil/sti/pdfs/ADA256133.pdf

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