For any following pairwise_distance-OMG-parallelism-is-tough-in-Python thing, @dimpase solved it — so grateful! 
https://github.com/oliviaguest/pairwise_distance/issues/2 …
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Looks like there's something from OSGeo that might be useful? You may have already found this. https://github.com/OSGeo/proj.4/wiki/GeodesicCalculations …
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omg nice!!

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good catch, although no docs for the library interface. one has to dig into geod source...
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I need great_circle so I used this and all done!

https://rosettacode.org/wiki/Haversine_formula#C … cc @usethespacebar — promise to try and learn some Cython... -
but I can't promise for this project as the C code is already loading and saving csvs. This was so so so much easier C > Python for this!
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they do it a bit differently in https://github.com/geopy/geopy/blob/master/geopy/distance.py … (lines 240-257)
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huh I wonder if it's actually different or not?
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it's probably not, just using arctan instead of arcsin. So you data is in degrees?
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latitude and longitude yeah
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decimal lat and lon not degrees though
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