Down to Earth

We know the Earth is round — have known since Eratosthenes measured its circumference twenty-three centuries ago. We teach it to every child, orbit satellites around it, photograph it from space. Yet our lived experience remains stubbornly flat: a horizon, a regional forecast, faraway events pinned onto a two-dimensional map. Five centuries after Copernicus, we still inhabit a pre-Copernican reality in practice — sensing neither the curvature beneath our feet, nor the 23.4° tilt that gives us seasons, nor the simple fact that someone in Sydney stands nearly upside down relative to someone in London, both clinging to a slightly oblate spheroid spinning at over 1,600 km/h. This page makes that invisible geometry tangible: choose two points on Earth and see how they truly relate — in distance, orientation, time, and the geology that separates them.