Apse line
In astrodynamics apse line (or line of apsides) is a common name for an imaginary line defined by orbit's eccentricity vector. It is strictly defined for elliptic, parabolic and hyperbolic orbits. For those orbits it can be imagined as a line:between orbit's periapsis and apoapsis - for circular orbitsbetween orbit's periapsis and focus - for parabolic and hyperbolic orbits Note: For circular orbits apse line is not defined as eccentricity is equal zero. As it is required as a base for definition of true anomaly it is usually arbitrarily assumed (usually as a line pointing into direction of vernal equinox)
See alsoApsisOrbit: circular, elliptic, parabolic and hyperbolicEccentricity (orbit) and eccentricity vectorTrue anomaly
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