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In orbital mechanics, the eccentric anomaly is an angular parameter that defines the position of a body that is moving along an elliptic Kepler orbit.The eccentric anomaly is one of three angular parameters ("anomalies") that define a position along an orbit, the other two being the true anomaly and the mean anomaly.
where M 0 is the mean anomaly at the epoch t 0, which may or may not coincide with τ, the time of pericenter passage. The classical method of finding the position of an object in an elliptical orbit from a set of orbital elements is to calculate the mean anomaly by this equation, and then to solve Kepler's equation for the eccentric anomaly.
where is the mean anomaly, is the eccentric anomaly, and is the eccentricity. The 'eccentric anomaly' E {\displaystyle E} is useful to compute the position of a point moving in a Keplerian orbit.
Unlike with mean anomaly, mean longitude is defined relative to the vernal point, which means it is defined for circular orbits. Eccentric anomaly at epoch (E 0) — the eccentric anomaly at the epoch time. Eccentric anomaly is defined at the angular displacement along the auxiliary circle of the ellipse (circle tangent to the ellipse both at ...
On the computation of the eccentric anomaly, equation of the centre and radius vector of a planet, in terms of the mean anomaly and eccentricity. Monthly Notices of the Royal Astronomical Society, Vol. 43, p. 345. Gives the equation of the center to order e 12. Morrison, J. (1883). Errata. Monthly Notices of the Royal Astronomical Society, Vol ...
The true anomaly is usually denoted by the Greek letters ν or θ, or the Latin letter f, and is usually restricted to the range 0–360° (0–2π rad). The true anomaly f is one of three angular parameters (anomalies) that defines a position along an orbit, the other two being the eccentric anomaly and the mean anomaly.
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where M 1 and M 0 are the mean anomalies at particular points in time, and Δt (≡ t 1-t 0) is the time elapsed between the two. M 0 is referred to as the mean anomaly at epoch t 0, and Δt is the time since epoch.