This Ellipses and Kepler's First Law lesson plan also includes:
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The class examines graphs in the form r = F(Â¿Â¿) in polar coordinates (r, Â¿Â¿), in particular with the circle, ellipse and other conic sections. They determine the nature of an ellipse by studying the role of the semimajor axis and eccentricity. They realize that the fixed point in a planetary system is its center of gravity.