Tuesday, May 10, 2016

Tonight's Sky for May 10: Jupiter Ends Retrograde for 2016

Tonight, Jupiter will appear stationary as seen from Earth as it ends its period of retrograde motion, or its apparent backwards movement, for the year. Why does this happen?It's all an optical illusion caused by a faster planet overtaking a slower one. A real life comparison is when passing a slower car on the highway when the car you're passing appears to fall behind you even though both cars are moving forward.   

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