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An apse line, or line of apsides, is an imaginary line defined by an orbit's eccentricity vector. It is strictly defined for elliptic, parabolic, and hyperbolic orbits.
For such orbits the apse line is found:〔(【引用サイトリンク】title=Line of apsides – Astronomy )〕
* for elliptical orbitsbetween the orbit's periapsis and apoapsis (also known as the major axis)
* for parabolic and hyperbolic orbitsbetween the orbit's periapsis and focus
For circular orbits apse line is not defined, because eccentricity is equal to zero. As it is required as a base for the definition of true anomaly, it is usually arbitrarily assumed (as a line pointing into the direction of the vernal equinox).
== See also ==
* Apsidal precession
* Apsis
* Eccentricity (orbit)
* Orbit: circular, elliptic, parabolic and hyperbolic
* True anomaly
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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