title: 1503 in science
text: # 1503 in science
  
  The year 1503 in science and technology included many events, some of which are listed below.
  
  ## Astronomy
  
  * July 23 – Unknown at this time, Pluto moves outside Neptune's orbit, remaining there for 233 years.
  
  ## Exploration
  
  * May 10 – Christopher Columbus first sights the Cayman Islands, which he names Las Tortugas after the numerous sea turtles there.
  
  ## Technology
  
  * April 21 – Battle of Cerignola: Spanish forces defeat the French, considered the first battle in history won by gunpowder small arms.
  * Giuliano da Sangallo constructs the city waIls of Arezzo in Tuscany using the new technology of bastions.
  
  ## Births
  
  * December 14 – Nostradamus, French physician and astrologer (died 1566)
  