What kind of weather changes does July filariasis refer to?

"July filariasis" means that the weather turns cold.

This means that in the evening of July in the lunar calendar, if the big Mars appears in the western sky, it means that the heat begins to fade; It will be cold in September, so you need to wear thick clothes.

In fact, "July" in "July filariasis" refers to August and September. The reason for misunderstanding is that people use different chronologies.

July fire explanation

Fire: the name of the constellation, namely the heart, appears in the south in June every summer, with the highest position, and gradually sinks to the west after July, so it is called "flowing fire".

Going to Qiu Lai in summer, the cold weather is coming.

However, "fire in July" has often been wrongly used to describe the summer heat for many years.

The lunar calendar was used in ancient times, and now the solar calendar is used. Generally speaking, July in the lunar calendar is equivalent to August and September in the solar calendar. In this way, "it gets cold in July" can be understood.

The "fire" in the "filariasis" here is not what we usually call "fire", but refers to Mars, which was called Antares in ancient times and Scorpio in modern times. It is one of the brightest constellations in the summer sky and can be used to judge the seasons. "Flow" means moving and falling. "filariasis" means that big Mars falls to the west.