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The speed of the moon's movement along the equator is not constant, and various factors cause it to slow down or increase in speed. The largest irregularity in the moon's movement, caused by the influence of the sun's gravitational pull (perturbation), is called ephemeris. If we consider a hypothetical moon moving at a constant speed along the equator, the actual position of the moon can vary by a maximum of ±1°16'. The period is 31.8 days. Source : Heibonsha Encyclopedia About MyPedia Information |
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月の白道上の運動は速度一定でなく，種々の原因により遅速を生ずる。この月の運動の不規則性のうち，太陽引力の影響（摂動）で起こる部分のなかで最も大きいものを出差という。白道上を一定の速度で動く仮想の月を考えたとき，出差による実際の月の位置のずれは最大±１°16′。周期は31.8日。
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