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At that time, Emperor Shizu of the Yuan Dynasty issued an order to build twenty-seven star observatories across the country. They watched the sun's shadow during the day and the polar stars at night to correct the calendar. The person in charge of the construction was Guo Shoujing, the scientist who compiled the "Time Calendar", the most advanced and longest-running calendar in ancient my country. A Central Plains wilderness. A plaintive sound. A man's figure walked from the horizon. Jiuquan launch base. There was a huge crowd and a wave of applause. Qin Tian waved to the crowd at the entrance of the spacecraft and then entered the spacecraft. Guo Li played the black xun in his hand and walked in the grass. Qin Tian was already seated, and the loudspeaker in front of the console came: "The launch countdown is 30 seconds!" Guo Li's fingers wandered back and forth on the sound hole of the Xun body. Qin Tian skillfully manipulated various buttons on the console.