The inclination of the Earth's orbit has a 100, 000-year cycle relative to the invariable plane.
2.
The invariable plane, the plane that represents the angular momentum of the Solar System, is approximately the orbital plane of Jupiter.
3.
See Poinsot's construction, which is summarized by the delightful phrase " the polhode rolls without slipping on the herpolhode lying in the invariable plane ".
4.
It has been proposed that a disk of dust and other debris exists in the invariable plane, and this affects the Earth's climate through several possible means.
5.
These two constraints operate in different reference frames; the ellipsoidal constraint holds in the ( rotating ) principal axis frame, whereas the invariable plane constant operates in absolute space.
6.
This change was needed because the poles of some asteroids and comets precess rapidly enough for their north and south poles to swap within a few decades using the invariable plane definition.
7.
For other planets in the Solar System, north is defined as being in the same celestial hemisphere relative to the invariable plane of the solar system as Earth's North pole.
8.
:See Poles of astronomical bodies, which has " The north pole is that pole of rotation that lies on the north side of the invariable plane of the solar system ".
9.
Laplace's name is sometimes applied to the invariable plane, which is the plane perpendicular to a system's mean angular momentum vector, but the two should not be confused.
10.
The invariable plane is simply derived from the sum of angular momenta, and is " invariable " over the entire system, while the Laplace plane may be different for different orbiting objects within a system.
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