An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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invariable plane
  هامُن ِ ناورتنده  
hâmon-e nâvartandé
Fr.: plan invariable  

Mechanics: For a rotating rigid body not subject to external torque, a plane which is perpendicular to the angular momentum vector of the body, and which is always tangent to its → inertia ellipsoid.

See also: Invariable negation of → variable; → plane.