Jupiter and Saturn go retrograde 🪐 This video explains the apparent retrograde motion of the outer planets using Jupiter and Saturn as examples. Saturn goes retrograde for about 4.5 months every year. Jupiter also moves “backwards” for approximately 4 months annually. 📖 Retrograde motion is an optical illusion caused by differences in the planets’ orbital speeds. When a planet seems to reverse its direction in the sky, it’s called retrograde motion (from the Latin word retrogradus – "going bac
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Mercury’s retrograde motion This video explains Mercury’s apparent retrograde motion in our skies: the inner planet appears to retrace its steps a few times per year. Every planet does this, every year. Retrograde motion is an optical illusion caused by differences in the planets’ orbital speeds. When a planet seems to reverse its direction in the sky, it’s called retrograde motion (from the Latin word retrogradus – "going backward"). Courtesy: Star Walk Based on video by James O'Donoghue / NASA
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