…According to Kepler's third law, the mean motion is not independent of the semimajor axis, but the mean motion can be determined with high accuracy by observing the orbital period. The perihelion longitude is sometimes used instead of the perihelion argument (= Ω + ω). In the motion of comets, the perihelion distance q , which is the distance from the perihelion to the Sun, is used as an orbital element instead of the semimajor axis. … *Some of the terminology that refers to "perihelion longitude" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…ケプラーの第3法則によって平均運動は半長径と独立ではないが,平均運動は公転周期を観測して高い精度で求めることができる。また近日点引数の代りに近日点黄経を使うこともある(=Ω+ω)。すい星の運動では,軌道要素として半長径の代りに近日点と太陽までの距離である近日点距離qが用いられる。… ※「近日点黄経」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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