《后汉书·本纪·肃宗孝章帝纪》
八月二十日，有彗星出现于天市星。
八月庚寅，有星孛于天市。
On the 20th day of the eighth month, a comet appeared in the sky star.
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 八月庚寅，有星孛于天市。 [/INST] On the 20th day of the eighth month, a comet appeared in the sky star.</s>
Identify the key themes in this Classical Chinese text and explain them in English: 八月庚寅，有星孛于天市。
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On the 20th day of the eighth month, a comet appeared in the sky star.
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