Meanings
plural apse lines
- astronomyAn 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.
Synonyms: apses line, apsidal line, apsis line, line of apsides
Synonyms & antonyms
nounAn 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.
Cite this entry
apse line. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/apse%20line
“apse line.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/apse%20line. Accessed November 3, 2026.
WatkinsX Dictionary, s.v. “apse line,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/apse%20line.
Source: apse line on Wiktionary, CC BY-SA 4.0.