The year 1520 in science and technology included many events, some of which are listed here.
Botany Publication of Le Grant Herbier ("The Great Herbal") in Paris.
Exploration November 1–28 – Ferdinand Magellan's fleet makes the first passage of the Strait of Magellan and he names the Pacific Ocean.
Births approx. date – Vincenzo Galilei, Italian scientist and musician (died 1591) Agatha Streicher, German physician (died 1581)
Deaths approx. date – Pedro Álvares Cabral, Portuguese explorer (b. c. 1467/8).
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