How fast do the planets rotate?

Answer

Dear Benjamin,

In answering your question I am going to assume you mean the speed of the planets in their orbit around the sun. Our entire solar system also moves at high speed relative to other galaxies and the center of the Milky Way.

If you make the simplification that the planets revolve in circles around the sun (which is a good approximation for the earth for example) you can easily estimate the speed by the distance traveled in one revolution (2 pi times the distance from the sun) divided by the time it takes. Since the orbits are in reality ellipses, the actual speed deviates from them, and is not constant either. The values ​​below are therefore average (actual) speeds.

Mercury: 172,332 km/h

Venus: 126,072 km/h

Earth: 107,219 km/h

Mars: 86,677 km/h

Ceres (dwarf planet): 64,375 km/h

Jupiter: 47,052 km/h

Saturn: 34,884 km/h

Uranus: 24,516 km/h

Neptune: 19,548 km/h

Pluto (dwarf planet): 16,798 km/h

Makemake (dwarf planet): 15,908 km/h

Eris (dwarf planet): 12,370 km/h

Note that the further away from the sun, the slower the orbital speed. This is a result of Newton’s laws.