Is the rotation speed of each planet the same? Is it the circumference of the planet which causes the length of the day? - Quora
Astrology Karan Virmani - Mercury is the smallest and innermost planet in the Solar System. Its orbital period around the Sun of 88 days . Average orbital speed: 47.362 km/s Sidereal rotation
![Dr James O'Donoghue 🪐 on Twitter: "Celestial objects to scale in size, rotation speed and tilt 🪐 https://t.co/KCfjHDABdF" / Twitter Dr James O'Donoghue 🪐 on Twitter: "Celestial objects to scale in size, rotation speed and tilt 🪐 https://t.co/KCfjHDABdF" / Twitter](https://pbs.twimg.com/ext_tw_video_thumb/1349051767204376577/pu/img/D5v6XODJ9yHeSRLV.jpg:large)