The Mass of the Earth

If you measured just the velocity and location of the earth as it moved rond sun, you could deduce exactly the mass of the sun. And that would tell you what gravitational force is necessary to move the earth in that path. So yet, the earth is like a little scale that's measuring the sun all the time. But wouldn't you need to know themass of the earth too, pretty accurately? Yes, absolte,. You need to knowThe mass of the earth can be determined using your knowledge of what it's made out of and its volume. Or you can bootstrap. Build like a calebration object, like a test object, like one kilogram,