《汉书·志·律历志上》
因此《春秋》上就说： 举中气来正月。 
是以《春秋》曰： 举正于中。 
Therefore, Chun Qiu says: The positive air rises to the first month.
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 是以《春秋》曰： 举正于中。  [/INST] Therefore, Chun Qiu says: The positive air rises to the first month.</s>
Identify the key themes in this Classical Chinese text and explain them in English: 是以《春秋》曰： 举正于中。
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Therefore, Chun Qiu says: The positive air rises to the first month.
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