Xie Cong’s “Lecture Notes on the Choice of the Star” PDF e-book download. Content Abstract Regarding the algorithm for counting the time from the sun to the mountain, the “Qin Ding Xie Ji Bian Fang Shu” introduces this: A is the North Pole, B is the zenith of the capital, and the distance between A and B is 50 degrees and 5 minutes. C and D are the equator, and E is the sun. The summer solstice is next to Jiawu, the sun goes to the pole at 66 degrees…

Xie Cong’s “Lecture Notes on the Choice of the Star” PDF e-book download.

Summary of content

About the algorithm of counting the time when the sun arrives at the mountain, “Imperial Xie Ji Bian Fang Shu” introduces this: A is the North Pole, B is the zenith of the capital, A and B are 50 degrees and 5 minutes apart, B and D is the equator, Wu is the sun, Jiawu is on the side of the summer solstice, the sun goes to the pole at 66 degrees and 30 minutes, that is, Wugeng is the high arc, Gengxin is the Taichen, and the longitude of the horizon is 7 degrees and 30 minutes from noon. , that is, use the arc triangle method for the angle of Geng, B, and Xin. The law sees the test into the above compilation to obtain the angle of 2 degrees and 26 minutes of the angle of pen, Jia and Yi, that is, the arc of Bing Ji is the time change of the sun from the equator at noon by 10 minus the noon, and the time from the sun to noon is obtained at the third quarter and five minutes of the first day of noon. It is also the time when the sun arrives at the square of Ding at the time when Jiawuzheng is at the beginning of noon. Yu followed suit.

<img class="size-full wp-image-26939 aligncenter" src="/wp-content/uploads/guoxuehuidian/1664891894-2e0ebfbd753c0db.jpg" alt="" / alt="Xie Cong "The Day of the Star" "Lecture Notes" Selected Day Astronomy Chapter 1" title="Xie Cong's "Tianxing Selected Day Lecture Notes" Selected Day Astronomy Vol.