Why don't the general books in society (books devoted to auspicious days) match the auspicious days found on the Internet?

There are many ways to choose a date, such as the round star method, the special method, the big Liu Ren method, the three-in-one method, the Kong Xuan Yi Gua method, the Zhouyi Yi Gua method, the Heluo counting method, the positive five elements method, and of course the killing of gods method.

Different theories lead to different results. Personally, I think the special method of choosing a day is the most reasonable.