The Book of Rites recorded that Tianzi would worship the Sun on the March equinox, and worship the Moon on the September equinox.

《礼记》记载，天子会在春分时祭日，秋分时祭月。

One of these days occurs a few days before the March equinox, and the other is a few days after the September equinox.

其中一天发生在三月春分之前几天，另一天发生在九月春分之后几天。

At the March equinox, the sun rises due east, and eventually, at the June solstice, it rises as far north of due east as it will all year.

在三月春分时，太阳从正东升起，最终在六月至日时，太阳会从全年最远的正东升起。