longitude of the perihelion

astronomy

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In orbit
…and NA is called the longitude of the perihelion. It defines the direction of the major axis in the plane of the orbit.
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In celestial mechanics: Chaotic orbits
…Ω + ω is the longitude of perihelion (see Figure 2). Within resonance, the angle θ librates, or oscillates, around a constant value as would a pendulum around its equilibrium position at the bottom of its swing. The larger the amplitude of the equivalent pendulum, the larger its velocity at…
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