《资治通鉴·齐纪·齐纪三》
九月，丁丑夜晚，孝文帝住在皇家祖庙里，率领文武百官哀哭完毕，孝文帝换上祭服，戴上素色帽子，腰束皮带，脚穿黑色鞋子，其余的文武官员们也都换上祭服，戴上黑色帽子，穿上白色绢丝单衣，腰束皮带，脚穿黑鞋。于是哀哭直到二更的时候。
九月，丁丑夜，帝宿于庙，帅群臣哭已，帝易服缟冠、革带、黑屦，侍臣易服黑介帻、白绢单衣、革带、乌履，遂哭尽乙夜。
On the night of ding-chou in the ninth month, Emperor Xiaowen stayed overnight at the Imperial Ancestral Temple, leading all the civil and military officials in lamentation. Emperor Xiaowen changed into mourning attire, and wore a plain hat, leather belt, and black shoes. The remaining civil and military officials also changed into mourning attire and put on black hats, white silk robes, leather belts, and black shoes. They lamented until the second watch of the night. 
<s>[INST] Kindly elucidate the central themes in this passage in English: 九月，丁丑夜，帝宿于庙，帅群臣哭已，帝易服缟冠、革带、黑屦，侍臣易服黑介帻、白绢单衣、革带、乌履，遂哭尽乙夜。 [/INST] On the night of ding-chou in the ninth month, Emperor Xiaowen stayed overnight at the Imperial Ancestral Temple, leading all the civil and military officials in lamentation. Emperor Xiaowen changed into mourning attire, and wore a plain hat, leather belt, and black shoes. The remaining civil and military officials also changed into mourning attire and put on black hats, white silk robes, leather belts, and black shoes. They lamented until the second watch of the night. </s>
Kindly elucidate the central themes in this passage in English: 九月，丁丑夜，帝宿于庙，帅群臣哭已，帝易服缟冠、革带、黑屦，侍臣易服黑介帻、白绢单衣、革带、乌履，遂哭尽乙夜。
user
On the night of ding-chou in the ninth month, Emperor Xiaowen stayed overnight at the Imperial Ancestral Temple, leading all the civil and military officials in lamentation. Emperor Xiaowen changed into mourning attire, and wore a plain hat, leather belt, and black shoes. The remaining civil and military officials also changed into mourning attire and put on black hats, white silk robes, leather belts, and black shoes. They lamented until the second watch of the night.
assistant