anomaly
An anomaly refers to the position of a planet or satellite that is defined by its angular distance from its last perihelion. It is considered an irregularity in the motion of a planet or satellite.
Anomaly has a lot of meanings. Anomaly means the angular distance of a planet from its perihelion as seen from the sun. Anomaly means something different.
Earth's angular momentum remains constant throughout its orbit around the Sun due to the conservation of angular momentum. The angular momentum at perihelion (closest point to the Sun) is the same as at any other point in its orbit.
When an object orbiting the Sun is at its closest distance to the Sun, it is said to be in perihelion.
If you triple your distance from an object, its angular size will appear smaller. This is because angular size is inversely proportional to distance – as distance increases, angular size decreases.
Pluto's perihelion distance is about 4.4 billion kilometers, while its aphelion distance is about 7.4 billion kilometers from the Sun. So, Pluto is closer to the Sun at perihelion and farther away at aphelion.
January 3, 2010 was the date of the "most recent" perihelion. Hopefully, not the "last" one.
perihelion
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when something moves with constant angular speed (w), as in a rotating disk, the speed (v) as you move away from the center depends on distance (r), but the angular speed does not. Mathematically, v = wr.
This is called perihelion.