《晋书·帝纪·第九章》
十月初一，有日蚀。初七，河间王司马昙之死。
冬十月辛亥朔，日有蚀之。丁巳，河间王昙之薨。
On the first day of the tenth month, an eclipse occurred. On the seventh day, King Sima Dan of Hejian died.
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 冬十月辛亥朔，日有蚀之。丁巳，河间王昙之薨。 [/INST] On the first day of the tenth month, an eclipse occurred. On the seventh day, King Sima Dan of Hejian died.</s>
Identify the key themes in this Classical Chinese text and explain them in English: 冬十月辛亥朔，日有蚀之。丁巳，河间王昙之薨。
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On the first day of the tenth month, an eclipse occurred. On the seventh day, King Sima Dan of Hejian died.
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