How to calculate reminders on the calendar?

There is a certain algorithm. You can find out the laws summarized by the ancients from the perpetual calendar, such as being suitable for breaking ground and getting married, which are all drawn from the experience of the ancients and the practice year after year. Because the earth is calculated in a cycle of 60 years, it will be the same cycle after 60 years, so these can be calculated. If everything is irregular, isn't the almanac nonsense? It can only be said that people now think this is unscientific and unreliable, because people's living environment has improved and their observation of the natural environment is far less than that of the ancients, so the ancients summed up these laws and passed them down to this day. Now many people can't understand them, so they think it's superstition. For a simple example, the ancients thought that it would be a great disaster for the tengu to eat the moon (that is, an eclipse). This is because when the sun, the moon and the earth are collinear, the attraction of the moon to the earth will increase, resulting in very high tides on the earth. So do you think the flood caused by high tide and a series of environmental changes are a disaster? Therefore, the taboos in the yellow calendar are scientifically stipulated, but many modern people can't understand them. Of course, even with those taboos, each of us still has to live a good day. We won't let you live for two days because of today's prosperity, and we don't have to live for tomorrow's fierceness, so these are credible, but it's best not to care too much.