The astronomical explanation for Mercury's retrograde motion in our skies: the inner planet appears to retrace its steps a few times per year. Every planet does this, every year. In fact, there is a planet in retrograde for 75% of 2020 (so, it's not unusual) pic.twitter.com/HBHThq475i
— Dr James O'Donoghue (@physicsJ) July 12, 2020
via Twitter https://twitter.com/physicsJ
July 12, 2020 at 08:08PM
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