Once in a generation — sometimes once in a century — the moon reminds humanity of its place in a larger, indifferent, and beautiful cosmos. On Wednesday evening, for the first time since 1905, the moon's shadow fell completely across Spain, extinguishing daylight for barely a minute and drawing millions across Europe into a shared moment of collective wonder. From Iceland's rain-soaked shores to London's greying parks to hilltop towns north of Madrid, people paused their ordinary lives to witness a geometry so precise and so ancient that no human hand could have arranged it. What makes such ev