The rotational axis of Earth, for example, is the imaginary line that passes through both the North Pole and South Pole, whereas the Earth's orbital axis is the line perpendicular to the imaginary plane through which the Earth moves as it revolves around the Sun the Earth's obliquity or axial tilt is the angle between these two lines.Įarth's obliquity oscillates between 22.1 and 24.5 degrees on a 41,000-year cycle. It differs from orbital inclination.Īt an obliquity of 0 degrees, the two axes point in the same direction that is, the rotational axis is perpendicular to the orbital plane. In astronomy, axial tilt, also known as obliquity, is the angle between an object's rotational axis and its orbital axis, which is the line perpendicular to its orbital plane equivalently, it is the angle between its equatorial plane and orbital plane. Earth's axial tilt (obliquity) is currently about 23.4° and will be 23.3° at the year 2760 August.
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