In astronomy, axial tilt, kent tae astronomers as obliquity, is the angle atween an object's rotational axis an its orbital axis, or, equivalently, the angle atween its equatorial plane an orbital plane.[1] It differs frae orbital inclination.

Tae unnerstaund axial tilt, we employ the richt-hand rule. When the fingers o the richt hand are curled aroond in the direction o the planet's rotation, the thumb pynts in the direction o the north pole.


  1. U.S. Naval Observatory Nautical Almanac Office (1992). P. Kenneth Seidelmann (ed.). Explanatory Supplement to the Astronomical Almanac. University Science Books. p. 733. ISBN 0-935702-68-7.