Where does the default Earth radius in ST_Distance_Sphere come from? – gis.stackexchange.com

Where does the default Earth radius in ST_Distance_Sphere come from? – gis.stackexchange.com

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MySQL says in the docs for ST_Distance_Sphere Calculations use a spherical earth and a configurable radius. The optional radius argument should be given in meters. If omitted, the default radius is ...

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