Given the size of the wavelength is multiples of the earth are they not able to sync up the section of the wave being measured and deduce further measurements f

Given the size of the wavelength is multiples of the earth are they not able to sync up the section of the wave being measured and deduce further measurements from there? You couldn't add 1 axis of another detector as a 3rd leg but having 3 measurements on 3 planes from 3 pairs of beams due to their positions on earth should. Each stations 2 axis measure 1 plane, and you build the 3 plane from the positions on the earths surface. Wouldn't the relative velocities of the earths spin, orbit and the solar systems velocity from the gravity wave origin all make the above measurements... difficult. Or all things considered, the angular tiny velocity from the origin makes that irrelevant. Physics is hard.