Astronomy and Calendar
In 665, Li introduced a reform calendar. It was called the Linde calendar. It improved the prediction of planets' positions and included an “intercalary month.” That is similar to the idea of a leap day. It would catch up a lunar year to a solar year because twelve lunar months are 1.3906 days short of one solar year. It was added every three years. The Linde calendar is the most prominent accomplishment of Li.
Li wrote a document complaining about the use of outdated equipment in the Imperial Astronomy Bureau, so he was commanded to construct a new armillary sphere. He completed it in 633. His construction had an additional third ring as opposed to the more common design of only two rings.
Read more about this topic: Li Chunfeng
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