Why does project give a different answer when reversing end points?

Shahar Barak <[email protected]>
Newsgroups gmane.comp.gis.gmt.user
Message-ID <CAL6UvMoOUj1vhVxMAzmyTACWQimdHHWOAHLodWHeVGvGUN8ePQ@mail.gmail.com>
echo "-117.000001 33" | project -C-118/33 -E-117/33 -Lw -Fxypqrs

-117.000001 33 0.838666571653 -3.9861033073e-09 -117.000001 33.000000004

echo "-117.000001 33" | project -C-117/33 -E-118/33 -Lw -Fxypqrs

-117.000001 33 0 3.9861033073e-09 -117 33

How come p=~0.84 and not ~0.999999 in the first case?

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