《左传·成公·成公十七年》
九月辛丑日，鲁国用了祭祀天地的礼仪。
九月辛丑，用郊。
On the day of Xin Chou in September, the rituals of offering sacrifices to heaven and earth were performed in Luguo.
<s>[INST] Kindly elucidate the central themes in this passage in English: 九月辛丑，用郊。 [/INST] On the day of Xin Chou in September, the rituals of offering sacrifices to heaven and earth were performed in Luguo.</s>
Kindly elucidate the central themes in this passage in English: 九月辛丑，用郊。
user
On the day of Xin Chou in September, the rituals of offering sacrifices to heaven and earth were performed in Luguo.
assistant