Hi. Why these functions returns different results? st_length_spheroid(GeomFromText('LINESTRING(0 0,180 0)',4326),'SPHEROID["WGS 84",6378137,298.257223563]') & st_distance_spheroid(geomfromtext('POINT(0 0)',4326), geomfromtext('POINT(180 0)',4326),'SPHEROID["WGS 84",6378137,298.257223563]')