<P> In astronomy, axial tilt, also known as obliquity, is the angle between an object's rotational axis and its orbital axis, or, equivalently, the angle between its equatorial plane and orbital plane . It differs from orbital inclination . </P> <P> At an obliquity of 0 degrees, the two axes point in the same direction; i.e., the rotational axis is perpendicular to the orbital plane . Earth's obliquity oscillates between 22.1 and 24.5 degrees on a 41,000 - year cycle; Earth's mean obliquity is currently 23 ° 26 ′ 12.6" (or 23.43684 °) and decreasing . </P> <P> Over the course of an orbital period, the obliquity usually does not change considerably, and the orientation of the axis remains the same relative to the background of stars . This causes one pole to be directed more toward the Sun on one side of the orbit, and the other pole on the other side--the cause of the seasons on Earth . </P>

What is the earth's tilt on its axis
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