The vernal equinox, however, occurs when the center of the sun crosses the Equator.
当太阳中心横过赤道之时,便是春分。
As the Sun crosses the celestial equator heading south, spring begins in the southern hemisphere and autumn in the north.
当太阳在天赤道上掉头向南的时候,南半球的春天开始而北半球则是秋天。
At each equinox, the sun crosses the Earth's equator, making night and day of approximately equal length on most of the planet.
在每一年的春分点上,太阳横跨着地球上的赤道,使得地球上大部分地区的白天和夜晚的时间接近相等。
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