1669 in science
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The year 1669 in science and technology included many events, some of which are listed here.
See also: 1668 in science, other events of 1669, 1670 in science and the list of years in science.
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Astronomy
- Montanari detects the variability of the eclipsing binary Algol
Geology
- Nicolas Steno puts forward his theory that sedimentary strata had been deposited in former seas, and that fossils were organic in origin