See also: 1668 in science, other events of 1669, 1670 in science and the list of years in science.

Table of contents

1 Astronomy 2 Geology 3 Births 4 Deaths

Astronomy

• Montanari detects the variability of the eclipsing binary Algol

• Nicolas Steno puts forward his theory that sedimentary strata had been deposited in former seas, and that fossils were organic in origin