This allows you to calculate the Earth's orbital velocity per second, as the orbital diameter in millions, divided by 10. So if you think the radius is 93m mil

This allows you to calculate the Earth's orbital velocity per second, as the orbital diameter in millions, divided by 10. So if you think the radius is 93m miles, you get 18.6 mile/sec, but if you are not American, you think the radius is 150m km, so 30 km/s. https://en.wikipedia.org/wiki/Earth's_orbit https://en.wikipedia.org/wiki/Earth's_orbit