《资治通鉴·汉纪·汉纪二十九》
十一月间，彗星出现，经过二十多天，消失。
十一月，彗星出，二十馀日，不见。
In November, a comet appeared, passing within twenty days, disappearing.
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 十一月，彗星出，二十馀日，不见。 [/INST] In November, a comet appeared, passing within twenty days, disappearing.</s>
Identify the key themes in this Classical Chinese text and explain them in English: 十一月，彗星出，二十馀日，不见。
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In November, a comet appeared, passing within twenty days, disappearing.
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