Acommon visual behavior is the âhead jerk.â This motion is generally observedwhen an individual otter approaches a raft of sea otters. The approaching otternoses and sniffs the other otters while jerking its head from side to side.
Axis tilt is the vertical angle at which the ball rotates. Axis tilt is what is commonly known as spin. Axis tilt is determined by the position of the thumb during the release. If the hand turns too early, the thumb exits on top of the ball. Bowlers with a high degree of axis tilt will be able to see the top of their hand during the release and follow through.
The Earth rotates around its axis once every 24 hours. It also revolves around the Sun once every 365.25 days. The axis of Earth's rotation is tilted 23.5 degrees from the plane formed by its orbit around the Sun. Figure 1 shows the axial tilt of Earth, with respect to its orbit.Figure 1. Earth's axial tilt. The angle of tilt equals the angle between the axis of rotation (through the poles) and a line that is perpendicular to the plane of the orbit.The celestial equator is an extension into space of Earth's equator.he angle of tilt equals the angle between the axis of rotation (through the poles) and a line that is perpendicular to the plane of the orbit. The celestial equator is an extension into space of Earth's equator.