Definitions from the Web
Retrograde Motion
Description:
Retrograde motion refers to the apparent backward movement of a celestial object in relation to the other stars or planets in its orbit. This phenomenon occurs when a faster-moving object passes by a slower-moving one, making it temporarily appear as if it is moving backward. 
Sample sentences:
  - During certain times of the year, Mars exhibits retrograde motion, causing it to appear to move in the opposite direction across the night sky.
 
  - Astronomers have studied retrograde motion extensively to understand the complex orbital dynamics of the planets.
 
  - Mercury periodically undergoes retrograde motion, leading to delays and miscommunications according to astrological beliefs.
 
 
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