Galileo publishes Letters on Sunspots
Year only · Date as reported
Galileo argued that sunspots are features of the Sun rather than bodies passing in front of it.
- Type
- astronomical observation
- Category
- solar science
- Organization
- Galileo Galilei
- Participants
- Galileo Galilei
Sources and attribution
- NASA — Solar science timeline (opens in a new tab) — Factual summary; source attribution retained.