Axial tilt
Venus: Venus is rotating very slowly in a retrograde direction, opposite to the direction of planets like Earth. The north pole of Venus is pointed 'down' (southward); hence the angle between the rotational axis of Venus passing through its north pole and the line perpendicular to its orbital plane is 177.4 degrees. There are various theories as to why this is. Its rotation and lack of a moon may be explained by gigantic impacts early in its life.