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但无论何方为真，天体退行的原因均和天体的质量变化有关。

But no matter where it is true, causes regression of celestial objects are and the quality of change.

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因此，行星质量的增大，离心力加大是退行的主要原因。

Therefore, the planet's mass increases, the centrifugal force to increase is the main regression.

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此月球交点有规则的退行是决定日食类型的另一个循环。

This regular regression of the Moon's nodes is the other cycle that determines the patterns of eclipses over time.