Grapes are typically an ellipsoid shape resembling a prolate spheroid. Rugby league is played with a prolate spheroid shaped football which is inflated with nitrogen. Another is that the Earth is slightly deformed into an oblate spheroid. Rugby league is played with a prolate spheroid shaped football which is inflated with air. Many submarines have a shape which can be described as prolate spheroid. It appears to be a prolate spheroid with strong concentrations of material along its equator. Improved types tend to be spheroid, oblate or flat. The fruit are spheroid to ellipsoid in shape, long and wide. However, some stars inhabit a "spheroidal halo" or "galactic spheroid", a type of galactic halo. WGS 84 subsequently changed to a slightly less flattened spheroid. The second defines a spheroid symmetric about the axis. However, in a spheroid the minor axes are symmetrical. The average diameter of the reference spheroid is . This great circle divides a spheroid into two hemispheres. An ovarian follicle is a roughly spheroid cellular aggregation set found in the ovaries.