Christopher Columbus wrote that he sailed in February 1477 to an island a hundred miles beyond Tile (Iceland). This trip, which would have led him to Greenland according to the distance he mentioned, was questioned many times in the 20th century. Arguments against accepting his claim have been that ice and snow would not have allowed him to make an expedition to the North in winter, and that the details he had given about the size of the tides (26 braccia) were far too overstated to be taken seriously. Taking into consideration new research concerning the change of climate at...