Autumn equinox 2019: When is the first day of autumn and what does it mean?
2019年秋分：秋天的第一天是什麼時候？它意味著什麼？
equinox ['ikwnks]
春[秋]分；【天文學】二分點；曆元；晝夜平分點
This year, the autumnal equinox takes place on Monday, September 23.
今年秋分發生在9月23日，星期一。
equinox ['ikwnks]
春[秋]分；【天文學】二分點；曆元；晝夜平分點
The equinox occurs because of the tilt of the Earth in relation to the sun. This is what causes the seasons.
秋分發生是因為地球相對太陽是傾斜的。這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，北半球向太陽傾斜，更多的光照落在北半球的地表，所以白晝更長。
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陽光。
Equinoxes occur when the axis of rotation of the Earth is exactly parallel to the direction of motion of the Earth around the sun.
當地球的自轉軸與地球繞太陽的運動方向完全平行時，就會發生晝夜二分點。
This means that day and night length is exactly 12 hours at all points on the Earth's surface.
這意味著地球表面的所有地方，白天和黑夜的長度正好是12小時。
Equal night
平分夜
The word equinox is Latin for "equal night".
秋分這個詞在拉丁語中是「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.
氣象學家用它作為季節的官方轉折點，雖然秋分每年日期不同，但它使我們能準確記錄（天文）。
It is celebrated around the world - notably at the Aztec monument Chichen Itza in Mexico.
全世界慶祝春[秋]分，尤其是在墨西哥奇琴伊察阿茲特克紀念碑。
During the equinox a sliver of light makes its way down the monument at sunset, drawing in crowds of onlookers.
每年南半球春分時節，夕陽下，一縷陽光穿過紀念碑下照下來，吸引了成群結隊的的觀光客。
圖片來自網絡，版權為原作者所有！