FitzRoy had found a discrepancy of 4 miles (6.4 km) in the meridian distance of longitude between his measurements and those of Albin Roussin, and decided to go back.
FitzRoy atopara unha discrepancia de 6,4 km na distancia de meridiano de lonxitude entre as súas medidas e as de Albin Roussin, e decidiu voolver.