Heavenly stems and earthly branches's chronology is rather chaotic. Please give me some advice!

Tiangan: A, B, C, D, E, Ji, G, Xin, Ren and Gui.

Dizhi: Zi, Ugly, Yin, Mao, Chen, Si, Wu, Wei, Shen, You, Xu and Hai.

Heavenly stems and earthly branches combination: 60 pieces of Jiazi, Yichou, etc. , use it back and forth.

Calendar year: beginning of spring is the beginning of a year.

Yue Ji: Starting from the twenty-four solar terms;

"beginning of spring" is the first day of the first month;

"Quiet" is in early February;

"Qingming" is in early March;

"Long summer" is in early April;

"Mangzhong" is in early May;

"Slight summer heat" is in early June;

"beginning of autumn" is in early July;

"Millennium" is in early August;

"Cold dew" is in early September;

"beginning of winter" is in early October;

"Heavy snow" is 1 1 at the beginning of the month;

"Slight cold" is the beginning of the twelfth lunar month.

I made it very clear. Come back if you have any questions.