There is a new reference geometry feature in 2004 called "Point". It has an interesting function that allows you to put a point on a sketch and give it a percentage value to determine it's position.
I thought someone might find this handy for animations along a path...
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Just open the file and hit rebuild to see it animate.I must warn everyone that there is a bug in that if you edit the definition of the point, the dimension changes from a percentage to linear units (inches, mm etc.). The dialog box still shows percentage however when you enable annotations and look and the dimension, it is linear.
So be careful, my equations will fail if you edit the points!
Mike Wilson