What is retrograde motion?   via Shareaholic

What is retrograde motion? via Shareaholic

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.

What is retrograde motion and why does a planet like Mars appear to change directions in the night sky? Is it playfully looping about in its orbit around the sun or is something less strange going on?

What is retrograde motion and why does a planet like Mars appear to change directions in the night sky? Is it playfully looping about in its orbit around the sun or is something less strange going on?

Retrograde motion of Jupiter or Mars or Saturn in our sky is an illusion, caused by Earth's passing these slower-moving outer worlds.  But there's a real retrograde motion, too.

Retrograde motion of Jupiter or Mars or Saturn in our sky is an illusion, caused by Earth's passing these slower-moving outer worlds. But there's a real retrograde motion, too.

Elusive anticrepuscular rays converge towards a point on the sky opposite the sun. Karl Diefenderfer caught them as 2016 came to a close, as a flock of geese was passing by.

Elusive anticrepuscular rays converge towards a point on the sky opposite the sun. Karl Diefenderfer caught them as 2016 came to a close, as a flock of geese was passing by.

What Is Mercury Retrograde + What Does It Mean For YOU?

It's Baaack! What Is Mercury Retrograde + What Does It Mean For YOU?

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.

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