Everything about Apse Line totally explained
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 elliptical orbits; also known as the
major axis
- between orbit's periapsis and focus - for parabolic and hyperbolic orbits
Note: For
circular orbits apse line isn't defined as
eccentricity is equal to zero. As it's required as a base for definition of
true anomaly it's usually arbitrarily assumed (usually as a line pointing into direction of
vernal equinox)
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