这个日期是玛雅人长计数周期的结束，但以后，就像你的日历1月1日重新开始，玛雅历法的另一个长期计数周期也会重新开始。

This date is the end of the Mayan long-count period but then, just as your calendar begins again on January 1, another long-count period begins for the Mayan calendar.

youdao

它们在我们今天的日历里是一年的第九、第十、第十一和第十二个月，但是在凯撒以前的古历法中，它们是一年的第七、第八、第九、和第十个月。

In our calendar today, they are the ninth, tenth, eleventh, and twelfth months. But in the old calendar before Julius Caesar, they were the seventh, eighth, ninth, and tenth months.

youdao

我们的闰年计算方法，即每四年就在日历上额外增加一天，以保证我们历法的准确性，但这也导致至日日期有点变化。

Our leap year system-which adds an extra day to the calendar every four years-ensures our calendars are accurate, but it also causes the solstice date to flop around a bit.

youdao