>I think by evenly spaced I mean equal arc lengths around the ellipse. Thanks for the idea.
You might find that quite tricky to achieve accurately: arc length of an ellipse involves some rather unpleasant calculus. Elliptic integrals are decribed here: http://mathworld.wolfram.com/EllipticIntegraloftheSecondKind.html
If your ellipse isn't very eccentric, you'll probably find my method works well enough for your purposes.
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