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Multiple fixes for more accurate distance calculations #2

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  • fabs instead of abs for more iterations checking tolerance
  • reevaluate cosine etc after lambda converenge
  • handle antipodies / long distances with negative sigma

Fixes #1 and more

- fabs instead of abs for more iterations checking tolerance
- reevaluate cosine etc after lambda converenge
- handle antipodies / long distances with negative sigma
@davidcrossey davidcrossey changed the title Multiple fixes Multiple fixes for more accurate distance calculations May 27, 2023
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use fabs() instead of abs() in C code
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