1504 in science

The year 1504 in science and technology included a number of events, some of which are listed below.

• probable date – Pedro Reinel's Atlantic chart is the earliest known nautical chart with a scale of latitudes, and with a wind rose having a clear fleur-de-lys.

• February 29 – Christopher Columbus uses his knowledge of a lunar eclipse this night to convince Jamaican tribesmen to provide him with supplies.
• November 7 – Columbus returns to Spain from his fourth and last voyage, in which he and his younger son, Ferdinand, explored the coast of Central America from Belize to Panama.

• Charles Estienne, French anatomist (died 1564)

• June 19 – Bernhard Walther, German astronomer (born 1430).

• exact date unknown – Domenico Maria Novara da Ferrara (born 1454), Italian astronomer.