Assertion: spatial reference system | /r/CapableOf | describe earth
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Source sentences:
text: The WGS 84 spatial reference system describes Earth as an oblate spheroid along north-south axis with an equatorial radius of a = 6378.137 {\displaystyle a=6378.137} km and an inverse flattening of 1 / f = 298.257 223 563 {\displaystyle 1/f=298.257\,223\,563} .