Two-sided difference - Nikinsa
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A periodic perturbation in the Moon's ecliptic longitude. It has an amplitude of 0.66 degrees and a period of a semisychus (14.7653 days). It is caused by the acceleration and deceleration of its angular velocity due to the gravitational pull of the Sun. Source: About Shogakukan Digital Daijisen Information | Legend |
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月の黄経に現れる周期的な摂動の一。振幅0.66度、周期は半朔望月（14.7653日）。太陽の引力のため、角速度が加速されたり減速されたりすることによる。
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