On May 10, 1497, Vespucci embarked on his first journey, departing from Cadiz with a fleet of Spanish ships.
In May of 1499 Vespucci set sail again. During this journey Vespucci is said to have discovered the Amazon River and Cape St. Augustine.
On May 14, 1501, Vespucci departed on another trans-Atlantic journey. He decided to start recording his accomplishments, writing that accounts of his voyages would allow him to leave "some fame behind me after I die."
On June 10, 1503, he began sailing again under the Portuguese flag. Vespucci discovered Bahia and the island of South Georgia.
Amerigo Vespucci developed a method for determining longitude.
Vespucci also helped to figure out the size of the earth; he calculated the length of the equator to within 50 miles of its true size.