《汉书·志·郊祀志下》
现令祠官把祭礼作为每年的事情，在四季祭祀长江、大海、雒水，为天下祈求丰年。 
其令祠官以礼为岁事，以四时祠江海雒水，祈为天下丰年焉。 
He ordered the officials of the ancestral temple to offer sacrifices at the end of each year, and to sacrifice the Changjiang (Yangtze) River, the ocean, and the Luo River in each of the four seasons, and to pray for a year of plenty throughout the realm.
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 其令祠官以礼为岁事，以四时祠江海雒水，祈为天下丰年焉。  [/INST] He ordered the officials of the ancestral temple to offer sacrifices at the end of each year, and to sacrifice the Changjiang (Yangtze) River, the ocean, and the Luo River in each of the four seasons, and to pray for a year of plenty throughout the realm.</s>
Identify the key themes in this Classical Chinese text and explain them in English: 其令祠官以礼为岁事，以四时祠江海雒水，祈为天下丰年焉。
user
He ordered the officials of the ancestral temple to offer sacrifices at the end of each year, and to sacrifice the Changjiang (Yangtze) River, the ocean, and the Luo River in each of the four seasons, and to pray for a year of plenty throughout the realm.
assistant