Last Updated:2025/12/03
(astronomy) 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.
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Noun
Japanese Meaning
天文学において、軌道の離心率ベクトルによって定義される仮想の直線のこと。楕円軌道では近点と遠点(大軸と呼ばれる)を結び、放物線や双曲線軌道では近点と焦点を結ぶ線となる。
( plural )