On the night of August 27, Earth will briefly stand between the sun and the moon, casting its shadow across 96% of the lunar surface and turning it the deep copper red that once made ancient observers wonder if the sky was wounded. Griffith Observatory in Los Angeles will open its grounds to the public from 7:25 p.m. to 11 p.m., asking nothing of visitors but their presence and their eyes. It is a rare and unhurried invitation — the next total lunar eclipse visible from the city won't come until 2029 — to remember that the cosmos occasionally arranges itself for anyone willing to look up.