Delisle apparently later changed his mind and announced the discovery on 1 April 1759, but other French astronomers discredited Delisle's claim, labelling the discovery an April Fools' joke. Delisle retired in 1760.
In 1759, Delisle changed his mind about the discovery and announced it on April Fool's Day; however, other French astronomers deemed it a prank. Delisle retired from his position in 1760.