The Earth rotates on its axis, which is an imaginary line passing through the North and South Poles. This axis is tilted at an angle of approximately 23.5 degrees relative to the plane of its orbit around the Sun. This tilt is what causes the changing seasons on Earth as different parts of the planet receive varying amounts of sunlight throughout the year. The axis of rotation remains relatively fixed in space, pointing in the same direction as Earth revolves around the Sun.