Why does ST_Distance_Sphere uses WGS 80?

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PostgreSQL's ST_Distance_Sphere function calculates the distances on earth:

float ST_Distance_Sphere(geometry pointlonlatA, geometry pointlonlatB);In its documentation, there is a peculiar note:

This function currently does not look at the SRID of a point geometry and will always assume its in WGS 80 long lat.

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My geometries are stored in WGS 84, which seems to be the de-facto standard for storing geospatial entities in PostgreSQL, an the reference coordinate system used by the GPS system.

Why does ST_Distance_Sphere uses WGS 80? Should I expect any significant error due to the coordinate system difference?



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