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jan 11, 1276 - 中国郭守敬创制简仪等十余种天文仪器，并进行天文观测，制订授时历。

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1276年中国郭守敬创制简仪等十余种天文仪器，并进行天文观测，制订授时历。

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2 May 2023

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jan 11, 1276

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~ 750 years ago

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