1503 in science
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The year 1503 in science and technology included many events, some of which are listed below.
Astronomy
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.{{cite book|authorlink=James Burke (science historian)|first=James|last=Burke|title=Connections|location=London|publisher=Macmillan|year=1978|isbn=0-333-24827-9|pages=255–256}}
Births
- December 14 – Nostradamus, French physician and astrologer (died 1566)