1. Eudoxos project Does the Sun Rotate? Dr. Omiros Korakianitis Ellinogermaniki Agogi Teachers workshop NCSR Demokritos, March 2003

2. Does the Sun Rotate? Class:Technology, Astronomy, Physics Grade:Senior High School Lesson:Study of the Solar Rotation

3. Description  Educational outcome  Purpose  Educational approach  Equipment required  Short description

4. Description  The structure of the lesson  Introduction  Detailed description of the teaching procedure

5. Theory Dark Sunspots

6. Theory Solar Rotation Sidereal rotation period: 25,380 days Mean synodic period: 27,275 days

7. Theory Solar Rotation

8. Measurement using coordinates

9. Rotation period determination

10. Student activities Avis Viewer   Measure the xmin, xmax, ymin, ymax   Compute x c, y c, R   Measure the x m, y m for each one of the sunspots   Compute x, y   Compute X, Y   Complete the tables

11. Student activities t Sunspots abcd (days)BL-L 0 B B B 0,000

12. Student activities t Sunspots abcd (days)BL-L 0 B B B 0,000 0,979 1,979 3,188

13. Student activities tΔtΔtL0L0 Sunspots abcd L-L 0 LΔLΔL LΔLΔL LΔLΔL LΔLΔL 0,000 0,979 1,979 3,188

14. Student activities   Compute ω ν(aver) for each one of the sunspots   Finally transform the ω ν(aver) to a rotation period T ν(aver) for each one of the sunspots

15. Extra activities - discussion Estimate the errors of this method by calculating the statistical standard deviation

16. www.ellinogermaniki.gr/ep/eudoxos