It takes roughly how long for the Earth's rotating axis to complete a full circle (precession)?
Precession Earth's axis to its orbit, and the eccentricity of its orbit over tens of thousands of years are all important parts of the astronomical theory of ice ages. "(See Milankovitch cycles.)" Axial precession is the movement of the rotational axis of an astronomical body, whereby the axis slowly traces out a cone. In the case of Earth, this type of precession is also known as the "precession of the equinoxes", "lunisolar precession", or "precession of the equator". Earth goes through one such complete precessional cycle in a period of approximately 26,000 years or 1° every 72 years, during which the
Nodal precession as positive but the inclination is greater than 90°, so the cosine of the inclination is negative.) In this case it is possible to make the precession approximately match the apparent motion of the sun, resulting in a heliosynchronous orbit. Nodal precession Nodal precession is the precession of the orbital plane of a satellite around the rotational axis of an astronomical body such as Earth. This precession is due to the non-spherical nature of a rotating body, which creates a non-uniform gravitational field. The following discussion relates to low Earth orbit of artificial satellites, which have no measurable effect on