When a perpendicular(PN) to the ellipse is so produced that it touches the auxiliary circle at some point (Q), then the angle thus produced ( NOQ) is called the Eccentric angle.
The ordinates of any point P on an ellipse and its corresponding point Q on its auxiliary circle are in constant ratio. i.e.
y1 ‗ b ‗ a √(1 – e2) = √(1 – e2)
y2 a a
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