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Autumn equinox 2019: When is the first day of autumn and what does it mean?
2019年秋分：秋天的第一天是什么时候？它意味着什么？
equinox ["ikwnks]
春[秋]分；【天文学】二分点；历元；昼夜平分点
This year, the autumnal equinox takes place on Monday, September 23.
今年秋分发生在9月23日，星期一。
equinox ["ikwnks]
春[秋]分；【天文学】二分点；历元；昼夜平分点
The equinox occurs because of the tilt of the Earth in relation to the sun. This is what causes the seasons.
秋分发生是因为地球相对太阳是倾斜的。这就是四季更替的原因。
During the summer time, the Northern hemisphere is tilted towards the sun. So we get longer days as more light falls on this part of the surface.
在夏季，北半球向太阳倾斜，更多的光照落在北半球的地表，所以白昼更长。
In the winter time it"s the Southern hemisphere that gets the majority of the light.
在冬季，南半球得到了大部分的阳光。
Equinoxes occur when the axis of rotation of the Earth is exactly parallel to the direction of motion of the Earth around the sun.
当地球的自转轴与地球绕太阳的运动方向完全平行时，就会发生昼夜二分点。
This means that day and night length is exactly 12 hours at all points on the Earth"s surface.
这意味着地球表面的所有地方，白天和黑夜的长度正好是12小时。
Equal night
平分夜
The word equinox is Latin for "equal night".
秋分这个词在拉丁语中是“平分夜”的意思。
Meteorologists use it as the official turning point in the seasons because, although it can vary from year to year, it allows for the most accurate record-keeping.
气象学家用它作为季节的官方转折点，虽然秋分每年日期不同，但它使我们能准确记录（天文）。
It is celebrated around the world - notably at the Aztec monument Chichen Itza in Mexico.
全世界庆祝春[秋]分，尤其是在墨西哥奇琴伊察阿兹特克纪念碑。
During the equinox a sliver of light makes its way down the monument at sunset, drawing in crowds of onlookers.
每年南半球春分时节，夕阳下，一缕阳光穿过纪念碑下照下来，吸引了成群结队的的观光客。
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