Identify the meaning of the term orbital eccentricity.
The gradual change in the shape of the Earth’s orbit around the Sun between circular and more elliptical.
The wobble of the Earth’s axis of rotation as it spins in space.
The variation in the angle of the Earth’s axial tilt over a 41,000-year cycle.
The cyclical change in the amount of solar radiation emitted by the Sun's surface.
