Stargazers applauded as they were plunged into darkness Sunday when the moon passed in front of the sun in a spectacular “ring of fire” eclipse. Astronomers and enthusiasts in Argentina were among the first to see the so-called annular eclipse as it crossed South America shortly after 1200 GMT, on course for Africa. The eclipse was most visible in a 100-kilometer (62-mile) band across Chile, Argentina, Angola, Zambia and the Democratic Republic of Congo.