近似法: approximate approachapproximate methodapproximation mathodapproximation methodapproximation procedureapproximation processcrude methodhalf-and-half methodmethod of a roximationmethod of ap
Very accurate predictions of planetary orbits require corrections to the central-field approximation . 想要非常准确地预言行星的轨道，就需要对中心场近似进行修正。
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The validity of the centralfield approximation rests on the great mass of the sun and on the relatively great separation of the planets . 中心场近似的准确性基于太阳的巨大质量以及行星之间的巨大距离。
