Ellipse as superposition of two uniform coplanar circular motions with opposite senses

Dragging the interactive red points with the mouse pointer you can change the two radii r+ (blue) and r- (green) and the center of the yellow ellipse:

r = r+ + r-.

Please enable Java for an interactive construction (with Cinderella).

Compare the animated version.

[ conics | GA with Cinderella ]

Soli Deo Gloria. Created with Cinderella by Eckhard Hitzer (Fukui).