space rotating on its tilted crops occurs once per twilight
meshing is rotation_transmission_process. if wind occurs then turn occurs. if brood occurs then sit_down occurs. orbiting is translational_vibration. if ripple occurs then fold occurs. if water_ski occurs then plane occurs. twilight_zone is not ocean_floor. twilight_zone is ocean_floor. if ripple does not occur then fold occurs. orbital_rotation is rotation.