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

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

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

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

Theory Dark Sunspots

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

Theory Solar Rotation

Measurement using coordinates

Rotation period determination

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

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

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

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

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

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