《汉书·志·五行志下之下》
后四年四月丙辰晦曰，又出现日食，在柬井星十三度。
后四年四月丙辰晦，日有食之，在东井十三度。
In the fourth year, on day Bingchen, there was a solar eclipse, which was 13 degrees from the Jianshi star.
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 后四年四月丙辰晦，日有食之，在东井十三度。 [/INST] In the fourth year, on day Bingchen, there was a solar eclipse, which was 13 degrees from the Jianshi star.</s>
Identify the key themes in this Classical Chinese text and explain them in English: 后四年四月丙辰晦，日有食之，在东井十三度。
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In the fourth year, on day Bingchen, there was a solar eclipse, which was 13 degrees from the Jianshi star.
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