Year#Sidereal.2C tropical.2C and anomalistic years

The anomalistic year, the time interval between two passages of the earth through its perihelion.

The orbit of the earth around the sun is elliptical, the sun next point is called perihelion in early January, the beginning of July sonnenfernste aphelion. The anomalistic year is the middle orbital period of the Earth.

Period (epoch J2000.0, in SI days ):

It starts on January 3, the mean date of perihelion.

The perihelion of the Earth

The position of the elliptical orbit the Earth in space is not constant. The influence of the gravity of the other planets causes the so-called perihelion. The direction of rotation of the line of apses of the orbital ellipse is the same direction as me the direction of rotation of the earth on this ellipse, the perihelion thus turns away from the approaching Earth. The anomalistic year is therefore slightly longer than the sidereal year, the duration of a Erdumlaufs in space fixed coordinates.

After about 112,000 years the Earth's orbit ellipse again has the same position in space. This period of a complete revolution of the apsides is called the cycle of the perihelion of the earth.

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