Animation of the apparent retrograde motion of Mars in 2003 as seen from Earth

Animation of the apparent retrograde motion of Mars in 2003 as seen from Earth

What is retrograde motion?   via Shareaholic

What is retrograde motion? via Shareaholic

Venus is one unique planet when it comes to rotational motion. It takes Venus 243 Earth days to completely rotate on its axis, but just 225 days to orbit the sun. Venus also is one of two planets that rotates in reverse, a phenomenon called retrograde motion, which according to most theories is due to an ancient planetary collision.

Venus is one unique planet when it comes to rotational motion. It takes Venus 243 Earth days to completely rotate on its axis, but just 225 days to orbit the sun. Venus also is one of two planets that rotates in reverse, a phenomenon called retrograde motion, which according to most theories is due to an ancient planetary collision.

Retrograde motion of Mars. Image credit: NASA

Retrograde motion of Mars. Image credit: NASA

What is retrograde? Sometimes the planets appear to change direction in the sky. This retrograde motion is entirely an illusion caused by the Earth passing the slower moving outer planets.

What is retrograde? Sometimes the planets appear to change direction in the sky. This retrograde motion is entirely an illusion caused by the Earth passing the slower moving outer planets.

Apparent Retrograde Motion of Mars - This animation shows the apparent retrograde motion of Mars in 2003, as seen from Earth - Created by : Eugene Alvin Villar (seav), as part of the Philip Greenspun illustration project

Apparent Retrograde Motion of Mars - This animation shows the apparent retrograde motion of Mars in 2003, as seen from Earth - Created by : Eugene Alvin Villar (seav), as part of the Philip Greenspun illustration project

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