The sun's arrival in Librabrings the fall equinox.
太阳进入天秤座带来了秋分。
Twice a year, at the Spring and Fall equinox, the Sun rises due east.
一年两次，春分和秋分，太阳从正东方升起。
It was only at two points in the year that the night and the day were of equal length and that was at the spring or fall equinox.
一年之中只有两次，白天和夜晚的长度一样，即春分和秋分。
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