What is the name of the effect causing the apparent change in position of stars due to Earth's motion?

The phenomenon that causes the apparent change in the position of stars due to Earth's motion is known as parallax. This effect occurs because as the Earth orbits the Sun, nearby stars appear to shift their positions against the background of more distant stars. Observers on Earth take measurements of the stars from different points in its orbit, and this change in position provides valuable information about the star's distance.

Parallax is essential in astronomy for determining distances to stars that are relatively close to the Earth, typically up to a few hundred light-years away. The degree of this shift is small for distant stars, which is why high-precision measurements are necessary. Other effects, such as redshift, refraction, and aberration, relate to different astronomical phenomena and do not specifically explain the change in star positions due to Earth's motion in its orbit.