People watch a total solar eclipse in Castrillo de la Reina, Spain, on Wednesday, Aug. 12, 2026. From Iceland to Spain, people flocked to viewing spots to see the moon completely block out the sun. (Finbarr O’Reilly/The New York Times) By JASON HOROWITZ The first total solar eclipse in decades in Europe swept across the Continent on Wednesday, turning day to dark across several countries as crowds watched from hilltops, coastlines and other open spaces. The coincidence of Earth, the moon and…