The concept of proper motion is related to the field of astronomy. This is the concept or principle regarding the movement of the planets or celestial bodies. The principle states that a certain celestial body, whether it is a planet or sun, changes its angular position over time, in reference to the mass center of the solar system. It is usually measured in seconds of arc per year or with the unit, “arcsec/yr”, where one degree is equivalent to 3600 [...]