What does it mean to send autumn cattle at the autumn equinox in 2020? What special phenomenon will appear?

What does it mean to send autumn cattle at the autumn equinox in 2020?

The autum

What does it mean to send autumn cattle at the autumn equinox in 2020? What special phenomenon will appear?

What does it mean to send autumn cattle at the autumn equinox in 2020?

The autumnal equinox is coming soon, and people will send pictures of autumn cows door to door. The picture is printed with red paper or yellow paper on the lunar solar terms all the year round, and also printed with farmers' ploughing patterns, which is called "Autumn Cattle Map". The pictures are all folk singers, who mainly say things like good luck in autumn ploughing that do not violate the farming season. Every time they go to a house, they say whatever they see until the owner is happy to give money. Although the words spoken are casual, every sentence rhymes beautifully. Commonly known as "Autumn", Qiu Ren is called "Qiu Guan".

What special phenomenon will happen at the autumnal equinox? The north and south poles live the same day, the height is as long as the shadow, and they cannot find their own shadow.

The north and south poles share the same day.

On the day of the autumnal equinox, the sun shines directly on the equator, and both poles can see the sun at the same time and share the same day.

Height is as long as shadow.

On the 45-degree north latitude line, the height of the building can be measured without climbing, because it seems that they have already discussed with their own shadows. The height of this day is as long as the shadow, so knowing the length of the shadow will also know the height of the building.

Can't find my own shadow

Because the direct point of the sun shines on the equator impartially, when you come to the equator, you will find that nothing can find your own shadow.

Autumn equinox weather and climate

According to the lunar calendar, "beginning of autumn" is the beginning of autumn and ends with "the first frost". The "vernal equinox" is exactly half of the 90 days from beginning of autumn to the first frost. From the day of the autumnal equinox, the climate has three main characteristics: the position of direct sunlight continues to move from the equator to the southern hemisphere, and the phenomenon of short days and long nights in the northern hemisphere will become more and more obvious. The days will gradually shorten and the nights will gradually lengthen (until the winter solstice reaches the longest night and the shortest day); The temperature difference between day and night will gradually increase, and the amplitude will be higher than 10℃. The temperature drops day by day, getting colder every day, and gradually entering the late autumn season. The situation in the southern hemisphere is just the opposite.

In addition, the Yangtze River Basin in China and its vast areas to the north have entered autumn, and the daily average temperature has dropped below 22℃. The cold air mass in the north began to have some influence. In most areas, the rainy season has just ended, with a cool breeze blowing gently, the sky is high and the clouds are light in Wan Liqing, the air is crisp in autumn, the sweet-scented osmanthus is fragrant, the crab is fat and the chrysanthemum is yellow, and the autumn equinox is a beautiful and pleasant season.