equation of the equinoxes

例句：

1. 1.The equinox marks the beginning of spring and the end of winter.
   春分标志着春天的开始和冬天的结束。
2. 2.The equinox is a time when the sun's position in the sky changes twice a year.
   春分是太阳在天空中位置每年改变两次的时间。
3. 3.During the equinox, many people celebrate by going on long walks or hikes.
   在春分期间，许多人通过进行长时间的散步或徒步旅行来庆祝。