Abstract
Rotating convection in spheres or spherical shells has been modeled in order to understand dynamics in planetary or stellar interiors. Existing theories have predicted various different types of symmetry for the dynamics at the onset of thermal convection. The only form of global convection not found so far is axisymmetric and equatorially symmetric. In this Letter, we for the first time, report the discovery of a solution bearing such symmetry. It is the geometric oblateness due to rotational flattening that is the key factor, which had not previously been considered.
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