<Ul> <Li> The earliest surviving Portuguese opinion is on the Cantino planisphere of 1502 . Because its demarcation line was midway between Cape Saint Roque (northeast cape of South America) and the mouth of the Amazon River (its estuary is marked Todo este mar he de agua doçe--"All of this sea is fresh water"--and its river is marked Rio grande, "great river"), Harrisse concluded that the line was at 42 ° 30'W on our sphere . Harrisse believed the large estuary just west of the line on the Cantino map was that of the Rio Maranhão (this estuary is now the Baía de São Marcos and the river is now the Mearim), whose flow is so weak that its gulf does not contain fresh water . </Li> <Li> In 1518 another Castilian opinion was provided by Martin Fernandez de Enciso . Harrisse concluded that Enciso placed his line at 47 ° 24'W on his sphere (7.7% smaller than ours), but at 45 ° 38'W on our sphere using Enciso's numerical data . Enciso also described the coastal features near which the line passed in a very confused manner . Harrisse concluded from this description that Enciso's line could also be near the mouth of the Amazon between 49 ° and 50 ° W . </Li> <Li> In 1524 the Castilian pilots (ships' captains) Thomas Duran, Sebastian Cabot (son of John Cabot), and Juan Vespuccius (nephew of Amerigo Vespucci) gave their opinion to the Badajoz Junta, whose failure to resolve the dispute led to the Treaty of Saragossa . They specified that the line was 22 ° plus nearly 9 miles west of the center of Santo Antão (the westernmost Cape Verde island), which Harrisse concluded was 47 ° 17'W on their sphere (3.1% smaller than ours) and 46 ° 36'W on our sphere . </Li> <Li> In 1524 the Portuguese presented a globe to the Badajoz Junta on which the line was marked 21 ° 30' west of Santo Antão (22 ° 6'36" on our sphere). </Li> </Ul> <Li> The earliest surviving Portuguese opinion is on the Cantino planisphere of 1502 . Because its demarcation line was midway between Cape Saint Roque (northeast cape of South America) and the mouth of the Amazon River (its estuary is marked Todo este mar he de agua doçe--"All of this sea is fresh water"--and its river is marked Rio grande, "great river"), Harrisse concluded that the line was at 42 ° 30'W on our sphere . Harrisse believed the large estuary just west of the line on the Cantino map was that of the Rio Maranhão (this estuary is now the Baía de São Marcos and the river is now the Mearim), whose flow is so weak that its gulf does not contain fresh water . </Li> <Li> In 1518 another Castilian opinion was provided by Martin Fernandez de Enciso . Harrisse concluded that Enciso placed his line at 47 ° 24'W on his sphere (7.7% smaller than ours), but at 45 ° 38'W on our sphere using Enciso's numerical data . Enciso also described the coastal features near which the line passed in a very confused manner . Harrisse concluded from this description that Enciso's line could also be near the mouth of the Amazon between 49 ° and 50 ° W . </Li> <Li> In 1524 the Castilian pilots (ships' captains) Thomas Duran, Sebastian Cabot (son of John Cabot), and Juan Vespuccius (nephew of Amerigo Vespucci) gave their opinion to the Badajoz Junta, whose failure to resolve the dispute led to the Treaty of Saragossa . They specified that the line was 22 ° plus nearly 9 miles west of the center of Santo Antão (the westernmost Cape Verde island), which Harrisse concluded was 47 ° 17'W on their sphere (3.1% smaller than ours) and 46 ° 36'W on our sphere . </Li>

Effect of the treaty of tordesillas on the americas