See also: 1603 in science, other events of 1604, 1605 in science, and the list of years in science.
Supernova 1604 is observed. As of 2003, this was the last supernova to be observed in the Milky Way.
Luis Vaez de Torres is the first European to sail through the Torres Strait.
France begins settling French Guiana.
Russian city of Tomsk founded, in Siberia.
Johannes Kepler describes how the eye focuses light.
Kepler specifies the laws of the rectilinear propagation of the light.