<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> <Table> <Tr> <Td> </Td> <Td> This section needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (June 2017) (Learn how and when to remove this template message) </Td> </Tr> </Table>

To whom did spain and portugal turn to help determine how to divide the world between them