The Aurora Islands was a group of three phantom islands first reported in 1762 by the Spanish merchant ship Aurora while sailing from Lima to Cádiz. The Aurora's officers reported sighting them again in 1774. The Spanish ship San Miguel fixed their location at 52°37'S, 47°49'W. On 20 February 1794, they were sighted again by a Spanish survey ship, the corvette Atrevida, which as part of the Alejandro Malaspina circumnavigation had been sent to confirm them. Their reported location was approximately halfway between the Falkland Islands and South Georgia at (53°S48°W). The latitude is considered perfect, the longitude was based on the meridian of the astronomical observatory, San Fernando, Cádiz.