polar orbit

Japanese: polar orbit(英語表記)polarorbit
polar orbit

... Based on their shape, satellite orbits are classified as circular, (long) elliptical, parabolic, or hyperbolic, and also as low-altitude orbits, geostationary orbits, etc., depending on the altitude and period of the orbit. An orbit with an inclination angle of 90 degrees is called a polar orbit.
[Orbital deviation]
The orbit of an artificial satellite is fixed to an inertial frame in a perfect spherical central force field or in a perfect vacuum, but in reality, it gradually changes due to various influences.

*Some of the terminology that mentions "polar orbit" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

… 人工衛星の軌道はこのように,その形状から,円軌道,(長)楕円軌道,放物線軌道,双曲線軌道に分類されるほか,軌道の高度や周期により,低高度軌道,静止軌道などと呼ばれることもある。なお,軌道傾斜角が90度の軌道は極軌道polar orbitという。
[軌道のずれ]
 人工衛星の軌道は,完全真球中心力場,完全真空中では慣性系に固定されるが,実際には,さまざまの影響によりしだいに変化していく。…

※「polar orbit」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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