1509 in science
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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
- September 10 – Constantinople earthquake.{{Cite FTP |last=Ambraseys|first=N. N.|date=December 2001|url=ftp://ftp.gfz-potsdam.de/pub/home/vst/lau/tsunami/Tsunami-Mittelmeer/Literatur/pdf/Ambraseys.2001.The%20Earthquake%20of%201509%20in%20the%20Sea%20of%20Marmara,.pdf|doi=10.1785/0120000305|title=The Earthquake of 1509 in the Sea of Marmara, Turkey, Revisited|volume=91|issue=6|page=1397|server=Bulletin of the Seismological Society of America|url-status=dead|bibcode=2001BuSSA..91.1397A}}
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 (died 1588)
- possible date – Guillaume Le Testu, French privateer, explorer and cartographer (k. 1573)
Deaths
- Juan de la Cosa, Spanish explorer and cartographer (b. c. 1460)