title: 1502 in science
text: # 1502 in science
  
  The year 1502 in science and technology included many events, some of which are listed below.
  
  ## Exploration
  
  * January 1 – Portuguese explorers, led by Pedro Álvares Cabral, sail into Guanabara Bay, Brazil, mistaking it for the mouth of a river, which they name Rio de Janeiro.
  * May 11 – Christopher Columbus leaves Cadiz, Spain for his fourth and final voyage to the New World.
  * May 21 – Portuguese navigator João da Nova discovers the uninhabited island of Saint Helena.
  * August 14 – Columbus lands at Trujillo and names the country 'Honduras'.
  * September 18 – Columbus lands in Costa Rica.
  * Amerigo Vespucci, on his return to Lisbon from a voyage to the New World, writes a letter, Mundus Novus, to Lorenzo de' Medici indicating that South America must be an independent continent.
  * The Cantino planisphere is the first known world map showing Portuguese discoveries.
  
  ## Technology
  
  * In Germany, Peter Henlein of Nuremberg uses iron parts and coiled springs to build a portable timepiece, the first "Nuremberg Eg".
  
  ## Births
  
  * Pedro Nunes, Portuguese mathematician (died 1578)
  * approx. date – Jorge Reinel, Portuguese cartographer (d. after 1572)
  