Retrograde motion is the apparent backward movement of a planet across the sky, as observed from Earth. This optical illusion occurs when Earth, traveling in its orbit, overtakes an outer planet like Mars, making the planet appear to reverse direction temporarily against the backdrop of stars.
Source: apod.nasa.gov
30/05/2025
15/04/2023
12/12/2020
08/11/2018
29/09/2018