invariable plane

The unvarying reference plane through the center of mass of the Solar System and perpendicular to the direction of the angular momentum vector of the Solar System. At present the ecliptic is inclined by 1°.58 to the invariable plane.

invariable plane

[in′ver·ē·ə·bəl ′plān] (mechanics) A plane which is perpendicular to the angular momentum vector of a rotating rigid body not subject to external torque, and which is always tangent to its inertia ellipsoid.

单词	invariable plane
释义	invariable plane invariable plane The unvarying reference plane through the center of mass of the Solar System and perpendicular to the direction of the angular momentum vector of the Solar System. At present the ecliptic is inclined by 1°.58 to the invariable plane. invariable plane [in′ver·ē·ə·bəl ′plān] (mechanics) A plane which is perpendicular to the angular momentum vector of a rotating rigid body not subject to external torque, and which is always tangent to its inertia ellipsoid.
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