If we're talking Heiwa, then atomic weapons make the list.
For the majority of FE'ers, you can count the South Pole. Most of them think there is either further land beyond it, an edge beyond it, or an ice wall nobody has seen.
For all FE'ers you can include fixed angular distances between stars, stellar aberration, solar flares, certain neutrino measurement experiments, gravity as measured by the pull of any body other than the earth, lunar craters, inertial guidance systems, gravitational lensing, measurements from theodolites and the Laws Of F*cking Physics.