ABOUT THE GRAPHIC

The home page graphic is a figure called an epicycloid. An epicycloid is made as follows:

1. Draw a circle of some radius.
2. Draw a smaller circle outside of the first circle, that touches the first circle.
3. Attach a pen at some point on the smaller circle.
4. Roll the smaller circle along the outside of the larger circle.
5. The pen on the smaller circle will trace out an epicycloid curve.

The epicycloid in the home page graphic has these parametric equations:

        x = 3 cos(t) + 0.7 cos (37/9 * t)
        y = 3 sin(t) - 0.7 cos (37/9 * t)

where t varies between 0 and 24 times pi.