After a descriptive tour of the solar system, we propose to understand the purpose of astronomical researches :
- to see the usefulness of positional astronomy for the ephemerides and the calendars,
- to explore some fundamental concepts and methods used in astronomy,
- to know more about your knowledge of some bodies of the solar system,
- to see the knowledge of the solar system through the history of astronomy,
- to use the present site for learning and teaching.