What kind of decoration does Gregorian calendar belong to?

Fragile decoration means that it is suitable for decoration and it is forbidden to build a house. If the decoration project has no commanding heights, there will be no problem. This thing is the Gregorian calendar, believe it or not. In fact, many things like ancient Gregorian calendar and geomantic omen are based on astronomy, meteorology, physics and ergonomics, but these terms have never been used before, but the basis of content is similar and there is a great scientific basis, so that is to say, as long as the weather is suitable, there will be no problem.