Since when do the days get shorter and the nights get longer?

After the autumnal equinox, the days get shorter and the nights get longer.

Every year around September 23rd, when the sun reaches 180 degrees, it is the autumnal equinox. Since the autumnal equinox, the position of direct sunlight has continued to move from the equator to the southern hemisphere, and the phenomenon of short days and long nights in the northern hemisphere has become more and more obvious, with shorter days and longer nights. The temperature difference between day and night will gradually increase, and the amplitude will be higher than 10 degrees Celsius. The temperature is dropping gradually, and the weather is getting colder every day.

After the autumnal equinox, it will get cold sooner or later. When you go out, you should put on clothes properly, and cover yourself at night to prevent colds. Before autumn clothes, you can hang clothes first.

Extended data

After the winter solstice, the days get longer and the nights get shorter.

According to the Gregorian calendar, the winter solstice is on February 22-23 every year, 12. On this day, the sun moves to the longitude of 270 degrees, with the southernmost latitude. The sun shines directly on the Tropic of Capricorn, with the shortest day and the longest night in the northern hemisphere (in the Arctic Circle, it is night all the time).

On the day of winter solstice, the height of the sun at noon in the northern hemisphere is also the lowest. For example, in Beijing, the height of the sun is only 26 42', because the shadow at noon is the longest, so it is also called "growing to the sun". From the solstice of winter, the days will gradually get longer. The ancients thought that this was the arrival of cathode and the birth of yang. Therefore, the winter solstice is considered as the real starting point of the annual cycle, the natural destiny cycle and the growth cycle of all things.

Will People's Daily Online-23rd 10: 29 usher in the autumn equinox? The days in the northern hemisphere are getting shorter and shorter.

People's Network-Winter solstice, long nights and short days (solar terms, phenology)