I am indebted to the courtesy of the Astronomer Royal, Mr. G. B. Airy, for the following information, which confirms Castanheda and Barros: “1520, April 17. There was certainly (from our own calculations) a total solar eclipse about 1.20 p.m. Greenwich time. But in the Art de verifier les dates, in which the extreme Southern eclipses are not included, none is mentioned for April 17: consequently the eclipse was a Southern eclipse, crossing the South Atlantic.”