The apparent change in position of an object due to a change in the position of the observer is called:

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Parallax is the apparent shift in position of an object when viewed from different points. This is commonly used in astronomy to measure distances to nearby stars. Retrograde motion refers to the apparent backwards motion of a planet in its orbit as viewed from Earth. Resolution refers to the ability to distinguish separate components in an image or signal. Red shift refers to the shift in the spectral lines of light from distant galaxies towards longer (red) wavelengths, indicating that the object is moving away from us.

The Apparent Change in Position of an Object Due to a Change