南交点经过它本命盘位置是另一个与上述周期同时发生的18年周期。
The South Node going over its natal position becomes another 18-year cycle which coincides with the above cycle.
这种变动正好比未移动时的交点快18.6天，形成较短的食年（约346.6天）。
The alignment happens 18.6 days sooner than if the nodes were not moving, creating the shorter eclipse year (about 346.6 days).
行运北交点经过本命盘北交点是以18年之久为一个周期行经黄道12星座。
Transiting North node going over the natal North node is an 18-year cycle as it takes that much time for the nodes to travel through the zodiac.
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