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jan 1, 1276 - 郭守敬创制简仪

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简仪是【元朝】科学家郭守敬革新浑仪，将其结构简化，精度提高，创造出的当时世界上先进的天文观测仪器

~设计和监制多种天文观测仪器

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人教版高中历史|Chinese students' PEP SENIOR HIGH HISTORY TEXTBOOKS

8 months ago

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jan 1, 1276

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~ 749 years ago

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