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So I'm looking into this answer, specifically
SELECT ST_DistanceSphere( ST_MakePoint(0,0), ST_MakePoint(0,1) );
st_distancesphere
-------------------
111195.07973463
(1 row)
Currently that returns 111195.07973463, disturbingly it should return
SELECT ((6370986 * 1 * pi()) / 180) AS dista...