Usually, you see this when Earth moves. It still looks like the star is moving across the night sky, but really your view is changing. This is similar to when you look at a still object while you are moving.
Retrograde Motion
Retrograde Motion
The apparent movement of a star used to measure its distance from Earth is called parallax. Astronomers observe how a star's position changes relative to more distant stars as Earth orbits the Sun, allowing them to calculate the star's distance based on the angle of this shift.
Apparent magnitude.
parallax
It means that its apparent movement - due to Earth's movement around the Sun - is greater, and that therefore the star is closer to us.
This is called "Apparent Magnitude".
Doppler effect. This effect causes the wavelengths of light from a star to appear shorter (blueshifted) as it moves towards the Earth and longer (redshifted) as it moves away, providing valuable information about the star's motion in space.
apparent magnatude
apparent magnatude
Motion parallax.
An apparent change in position of a star due to the movement of the Earth in it's orbit. The closer the star is there is a larger shift and the further the star is there is a smaller shift.