1509 in science
The year 1509 in science and technology included many events, some of which are listed here.
Exploration
- September 11 – Diogo Lopes de Sequeira reaches Malacca, having crossed the Gulf of Bengal.
Geology
Mathematics
- June 11 – Luca Pacioli's De divina proportione, concerning the golden ratio, is published in Venice, with illustrations by Leonardo da Vinci.
Births
- Bernardino Telesio, Italian philosopher and natural scientist possible date – Guillaume Le Testu, French privateer, explorer and cartographer