14 Stock up on DVDs and fire up the sunlamp: Uranus's axis of rotation is nearly aligned with the plane of its orbit, meaning that each pole on Uranus experiences a 42 - year - long summer of steady sunshine — followed by a depressing 42 years of winter darkness. (discovermagazine.com)
The earlier radar data also revealed that Mercury spins on an axis almost perpendicular to the plane of its orbit, so that the planet does not have true seasons. (newscientist.com)
There's a fascinating recent simulation by a group led by Manuela Campanelli and Carlos Lousto, who are now at the Rochester Institute of Technology, in which the two holes are spinning with their axes pointed in opposite directions in the plane of their orbit. (discovermagazine.com)