Eudoxos project Does the Sun Rotate Teachers workshop

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

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

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

Description q The structure of the lesson q Introduction q 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 q q q Measure the xmin, xmax, ymin, ymax Compute xc, yc, R Measure the xm, ym for each one of the sunspots Compute x, y Compute X, Y Complete the tables

Student activities Sunspots t a (da ys) 0, 0 00 B b L-L 0 B c L-L 0 B d L-L 0 B L-L 0

Student activities Sunspots t a (days ) 0, 000 0, 979 1, 979 3, 188 B b L-L 0 B c L-L 0 B d L-L 0 B L-L 0

Student activities Sunspots t Δt a L 0 LL 0 0, 00 0 0, 97 9 1, 97 9 3, 18 8 L b ΔL LL 0 L c ΔL LL 0 L d ΔL LL 0 L ΔL

Student activities q Compute ων(aver) for each one of the sunspots q Finally transform the ων(aver) to a rotation period Tν(aver) for each one of the sunspots

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

www. ellinogermaniki. gr/ep/eudoxos