When is the day of yin and yang?

Odd numbers are positive and even numbers are negative. You can do the math yourself.

Ten heavenly stems: a, b, d, e, g, f, n, g, n, g, 12 earthly branches: ugly Mao Yinchen, Shen Youxu, Hai Sixty Jiazi: The most timely method is to combine ten heavenly stems with twelve earthly branches, with a total of 60 combinations. The first combination is Jiazi. Cycle every 60 years. Specific combinations: Jiazi, Yechou, Bingyin, ... Gui You, JOE, Yihai, Bingzi, ... That is to say, heavenly stems and earthly branches takes one stem or branch in their respective order to form a combination, totaling 60 species. The ancients defined odd-numbered heavenly stems as yang and even-numbered heavenly stems as yin. For example, this year is the year of Xu Bing, which is the year of Yang, because the sky is dry, Yin and Yang are fixed, and C is an odd position. Similarly, the ancients also used these 60 combinations to calculate the month, day and time. For example, in a cloudy year, there are many combinations when the moon is cloudy and the sun is cloudy. For example, when the moon is cloudy and the sun is cloudy in rainy years, the sun is between 8: 00 and 3: 00 last August 1 Sunday afternoon 1 Sunday. However, in the four pillars, that is, the eight characters, it is determined that the heavenly stem is Ding, that is, Ding Weishi. B, D, D cloudy days are all dry, so cloudy days in the month are all cloudy.