Perihelion and Aphelion: "The closest point to the Sun in a planet’s orbit is called perihelion. The furthest point is called aphelion. Notice how the planet moves fastest at perihelion and slowest at aphelion.
axial tilt looks like degrees according to geomagnetic storm cell patterns oct 8 2012 - periodicity every years from radiation equator earth's axis it will be interesting. ice shelves form and cooler summers are caused by this type of degree axial tilt.