- News
- Science
- Scientific Bodies
- Divisions
- Commissions
- Commission A1 Structure
- Commission A2 Structure
- Commission A3 Structure
- Commission A4 Structure
- Commission B1 Structure
- Commission B2 Structure
- Commission B3 Structure
- Commission B4 Structure
- Commission B5 Structure
- Commission B6 Structure
- Commission B7 Structure
- Commission C1 Structure
- Commission C2 Structure
- Commission C3 Structure
- Commission C4 Structure
- Commission C5 Structure
- Commission D1 Structure
- Commission E1 Structure
- Commission E2 Structure
- Commission E3 Structure
- Commission E4 Structure
- Commission F1 Structure
- Commission F2 Structure
- Commission F3 Structure
- Commission F4 Structure
- Commission G1 Structure
- Commission G2 Structure
- Commission G3 Structure
- Commission G4 Structure
- Commission G5 Structure
- Commission H1 Structure
- Commission H2 Structure
- Commission H3 Structure
- Commission H4 Structure
- Commission J1 Structure
- Commission J2 Structure
- Commission J3 Structure
- Commission X1 Structure
- Commission X2 Structure
- Past Commission Organising Committees
- Working Groups
- Centres
- Scientific Meetings
- Rules & Guidelines
- General Assemblies
- Meeting Proposals
- Future IAU Meetings
- General Assemblies
- EC Meetings
- Officers' Meetings
- Regional Meetings
- Symposia
- Focus Meetings
- Institutional Meetings
- IAU Offices Meetings
- IAU-Sponsored Meetings
- Letters of Intent submitted for 2024
- Letters of Intent submitted for 2023
- Letters of Intent submitted for 2022
- Letters of Intent submitted for 2021
- Letters of Intent submitted for 2020
- Past IAU Meetings
- Templates
- Other Meetings
- Grants & Prizes
- Scientific Bodies
- Publications
- IAU Publications
- IAU Strategic Plan
- Symposia
- WGSBN Bulletins
- Regional Meetings
- Information Bulletins/Catalyst
- E-Newsletters
- Focus Meetings
- Transactions A
- Transactions B
- Related Publications
- GA Newspapers
- CAPjournal
- IAU Books
- Brochures
- IAU Offices
- WG Reports
- Commission Reports
- Division Reports
- Past IAU Publications
- Rules, Guidelines and Instructions for Proceedings
- Publishers
- IAU Publications
- Administration
- About the IAU
- Statutes & Rules
- IAU Policies
- IAU Executive Bodies
- IAU Secretariat
- Resolutions
- Members Administration
- Administrative Dates & Deadlines
- International Organisations Relations
- Donate to the IAU
- Training in Astronomy
- Astronomy for Education
- Astronomy for Development
- Astronomy for the Public
- Office for Astronomy Outreach
- FAQ
- Themes
- Satellite Constellations
- Astronomy in Everyday Life
- How to Report a Discovery
- Careers in Astronomy
- Defining our Place in the Cosmos
- The Constellations
- Light Pollution
- Measuring the Universe
- Near Earth Objects
- How to Participate in Astronomy Research
- Naming of Astronomical Objects
- Naming of Exoplanets
- Buying Star Names
- Naming Stars
- Pluto and the Solar System
- IAU Member Statistics
- Our Moon: the Moon
- Meteors & Meteorites: The IAU Definitions of Meteor Terms
- UNESCO-IAU Portal to the Heritage of Astronomy
- Social Media
- Past Events
- Call for Online Resources
- Astronomy@Home Awards
- Contact
Sunspots recorded by Galileo
A drawing of the Sun made by Galileo Galilei on 23 June 1613 showing the positions and sizes of a number of sunspots. Galileo was one of the first to observe and document sunspots.
Credit:
The Galileo Project/M. Kornmesser
