You can see stars near the celestial equator making their big circles.

你可以看到恒星在天球赤道附近形成大的圆圈。

Stars on the celestial equator would appear to circle the horizon once per day.

在天球赤道上的星星每天会在地平线上绕过一圈。

At the north pole, you only see stars north of the celestial equator.

在北极，你只能看到天球赤道以北的星星。

At the Earth's south pole, you only see stars south of the celestial equator.

在地球的南极，你只能看到天球赤道以南的恒星。

In ancient times, it was believed that on this day, the length of the day and night was equal, and the sun was at the midpoint of the celestial equator, creating a balance between yin and yang.

古人认为这一天昼夜等长，太阳在赤道中点，阴阳平衡。