At 09:51 universal time (UT) on August 27th, Earth makes its closest approach to Mars in nearly 60,000 years. The two worlds, center-to-center, will be just 56 million kilometers apart–a short distance on the scale of the solar system. The last people to come so close to Mars were Neanderthals. Magazine articles, newspapers, and TV shows have touted the encounter for months. But they all omitted one detail: Which part of Earth?