Assertion: ellipsoid | /r/ObjectUse | used in theoretical calculations
Facets:
value: sometimes
type: TEMPORAL
Source sentences:
text: Since it has been determined that the earth is oblate not only in the direction of its poles but also about its equator, although only very slightly, an ellipsoid with three unequal axes, the smallest of which coincides with the earth’s axis of rotation, is sometimes used in theoretical calculations.