What are the meanings of "single day" and "double day" in the Gregorian calendar?

A single day refers to odd numbers, that is, one, three, five, seven, nine and so on. Double dates refer to even numbers, for example, two, four, six, eight, ten and so on.

In ancient China, people attached great importance to the choice of auspicious days, regardless of their wedding, bedstead, travel and sacrifice. In the past, old calendars and old calendars were often filled with all kinds of information about choosing dates, which was very popular and popular.

Most rural areas and large-scale construction projects will start, and the date will still be specially selected. For example, in rural areas, building houses, capping beams, building sites and starting construction will all see Feng Shui on another day, but such things will not be publicized for well-known reasons.

Extended data:

In fact, the reason for choosing a day to study is very simple. Humans (people) live in a corner (space) of the earth, and in the long river of time (time), they are carrying out various activities (things) all the time.

The sun, moon and stars around us are changing all the time, and all kinds of magnetic fields and environmental conditions are also changing, which has obvious influence on human beings (including the growth and reproduction of animals and plants). Doing something at different times and at different times will naturally bring good luck and bad luck.

Because time is not just an empty number, it is also a coordinate, corresponding to the birth and death of various energies. These visible or invisible energies are profoundly affecting our human activities.