Eccentric anomaly (/m/03vcsx)

In orbital mechanics, eccentric anomaly is an angular parameter that defines the position of a body that is moving along an elliptic Kepler orbit. For a point P orbiting in an ellipse, the eccentric anomaly is the angle E in the figure to the right. It is determined by drawing a line perpendicular to the major axis of the ellipse through the point P and locating its intercept P′ with the auxiliary circle, a circle of radius that enscribes the entire ellipse. This intersection P′ is called the corresponding point to P. The radius of the auxiliary circle passing through the corresponding point makes an angle E with the major axis. The eccentric anomaly is one of three angular parameters that define a position along an orbit, the other two being the true anomaly and the mean anomaly.
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