An astronomical explanation for 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. In fact, there is a planet in retrograde for 75% of 2020 (not unusual) [OC]: from r/aww
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![An astronomical explanation for 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. In fact, there is a planet in retrograde for 75% of 2020 (not unusual) [OC]](https://b.thumbs.redditmedia.com/nHshq7w5FJj7z4-CdRMuKnP7s6SRL6fgQXW4beA5BBM.jpg "An astronomical explanation for 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. In fact, there is a planet in retrograde for 75% of 2020 (not unusual) [OC]") | submitted by /u/physicsJ [link] [comments] |
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