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An orbital node is one of the two points where an orbit crosses a plane of reference to which it is inclined.〔(node ), entry in ''The Columbia Encyclopedia'', 6th ed., New York: Columbia University Press, 2001–04. Accessed on line May 17, 2007.〕 An orbit that is contained in the plane of reference (called ''non-inclined'') has no nodes. == Planes of reference == Common planes of reference include: * For a geocentric orbit, the Earth's equatorial plane. In this case, non-inclined orbits are called ''equatorial''.〔(line of nodes ), entry in ''The Encyclopedia of Astrobiology, Astronomy, and Spaceflight'', David Darling, on line, accessed May 17, 2007.〕 * For a heliocentric orbit, the ecliptic. In this case, non-inclined orbits are called ''ecliptic''.〔 * For an orbit outside the Solar System, the plane through the primary perpendicular to a line through the observer and the primary (called the ''plane of the sky'').〔(''Celestial Mechanics'' ), Jeremy B. Tatum, on line, accessed May 17, 2007.〕, chap. 17. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Orbital node」の詳細全文を読む スポンサード リンク
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