The first method is very simple; it is based on the division of obtuse and acute angles, using the characters "ju" and "gou".
"Ju" indicates obtuse, and "gou" indicates acute.
"Ju and gou with the ruler" means a right angle.
But the second method is more complicated.
It is somewhat similar to measuring directions:
Using the twelve earthly branches: Zi, Chou, Yin, Mao, Chen, Si, Wu, Wei, Shen, You, Xu, Hai, together with the ten Heavenly Stems: Jia, Yi, Bing, Ding, Geng, Xin, Ren, Gui and the eight trigrams: Qian, Kun, Gen, Xun to create a set of twenty-four specific names to represent angles.
This means each name roughly represents fifteen degrees.
However, it's quite strange... you could even say it's still an unsolved mystery to this day...
The ancient sages of Huaxia actually understood the concept of 360:
The ancestors used a division system for celestial bodies that was actually 365 and 1/4 degrees.
In a sense.
This was infinitely close to the 360-degree method.
