goldset

Whole file

geographiclib/geographiclib-python

The author described this change as “Fix bug in geodesic inverse solution for very prolate ellipsoids.”. It counts as a record because the check below fails on the code as it stood at a1a9d0abb and passes on 07fde3b06, with nothing else changed between the two runs.

Projectgeographiclib/geographiclib-python
Fix saved2025-08-21
Sharing licenceMIT · LICENSE
Change size+1 −1

What the code was meant to do, written into the code itself as a save note

Fix bug in geodesic inverse solution for very prolate ellipsoids.

The change

804804 #
805805 # In fact, we will have sig12 > pi/2 for meridional geodesic which is
806806 # not a shortest path.
807- if sig12 < 1 or m12x >= 0:
807+ if sig12 < Geodesic.tol2_ or m12x >= 0:
808808 if (sig12 < 3 * Geodesic.tiny_ or
809809 # Prevent negative s12 or m12 for short lines
810810 (sig12 < Geodesic.tol0_ and (s12x < 0 or m12x < 0))):

The check that tells the two apart

fail→pass·geographiclib/test/test_geodesic.py::GeodSolveTest::test_GeodSolve100

Check file geographiclib/test/test_geodesic.py, taken without changes from the fix and copied onto the older code, so the exact same check runs against both versions.

Origin and history

The fix07fde3b06fb89d749eec0f53d8b6f1fcd4b413eb
The code before ita1a9d0abb3d085bbaad0100d502129209b6ca5ca
Broken version dated2025-08-21
Modulegeographiclib.geodesic
Units changedGeodesic
Fingerprint1677b3ef1c86c463
Checked2026-08-18 by goldset/0.1

Every field above is generated by our program. None of it is written by hand.

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