apse line (English, noun)
expansion: apse line (plural apse lines)
Senses:
topics: astronomy
natural-sciences
glosses: An imaginary line defined by an orbit's eccentricity vector. For such orbits the apse line is found: for elliptical orbits – between the orbit's periapsis and apoapsis (also known as the major axis) for parabolic and hyperbolic orbits – between the orbit's periapsis and focus.
Forms:
form: apse lines
tags: plural