N → another name for year
This date shifting is a result of the discrepancy between a human calendar year—which is usually counted as 365 days—and an astronomical year, which is about 365.24 days.
这个日期的变化是人类的历年（通常以365天为计）与天文年（以365.24天）之间的差异而产生的。
It turns out, however, that there are 365.24219 days in an astronomical "tropical" year-defined as the time it takes the sun, as seen from Earth, to make one complete circuit of the sky.
尽管这样，实际上在天文上一回归年中有365.24219天——一回归年指的是由地球上观察，太阳在天空运行一整个圆周所用的时长。
So Emmerich found a way to kill the Earth using a faux astronomical event (there is no planetary alignment in the year 2012) and by inventing a solar interaction that has never been observed.
导演艾默里克用一个虚假的天文事件毁灭了地球(2012年是不会出现行星对其的现象的)，他还无中生有了从未观测到的太阳系互动行为。
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