《后汉书·本纪·肃宗孝章帝纪》
二十一日，章帝到泰山，烧柴祷告岱宗。
辛未，幸太山，柴告岱宗。
On the 21st day, Emperor Zhang reached Mount Tai, where he burned firewood and prayed to the god of Mount Tai.
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 辛未，幸太山，柴告岱宗。 [/INST] On the 21st day, Emperor Zhang reached Mount Tai, where he burned firewood and prayed to the god of Mount Tai.</s>
Identify the key themes in this Classical Chinese text and explain them in English: 辛未，幸太山，柴告岱宗。
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On the 21st day, Emperor Zhang reached Mount Tai, where he burned firewood and prayed to the god of Mount Tai.
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