What is autumn like in the North and South Poles？ Counting scientific anecdotes about autumn

　　Reference message networkReported on September 26th.Autumn is a transitional season to undertake hot summer and cold winter. In our minds, the most striking feature of autumn is colorful autumn leaves, as well as the numerous fruits and full ears of grain. In the face of such a wonderful autumn color, a series of interesting little questions occasionally jump into our minds: why is the autumn equinox not on the same day every year? Do people born in autumn really live longer? What is autumn like in the North and South Poles? An article on the website of Spanish "Fun" monthly magazine on September 24th came together for us.

　　According to the report, after the autumnal equinox, autumn officially came. As the position of direct sunlight continues to move from the equator to the southern hemisphere, the days are getting shorter and the nights are getting longer in the northern hemisphere where we live.

　　The autumnal equinox is not the same day every year. It may be September 22nd or 23rd. The main reason is that the revolution of the earth around the sun is not exactly 365 days, but 365.25 days. In order to make up for this time difference, mankind set up leap year from 2000 years ago. Every four years is a leap year, and February of this year has 29 days. Therefore, in every leap year, the autumnal equinox goes backwards from September 22nd to 23rd every year.

　　Longevity is the dream of many people, and people born in autumn are no exception. According to a survey by the University of Chicago, there are more centenarians born in autumn than in other seasons. People’s life span is influenced by many factors, such as whether they eat properly and exercise regularly, whether they drink alcohol, smoke or get seriously ill, and whether they are negatively affected by the environment. This study shows that another factor plays a key role, and that is the month of birth. Researchers surveyed more than 1,500 centenarians born between 1880 and 1895 and compared their data with their siblings and spouses. The results show that 30% centenarians were born in autumn.

　　Autumn is the harvest season in many places, but the situation is slightly different at the poles of the earth. After the summer solstice, the range of extreme day near the Arctic Circle will gradually shrink, and the extreme day will disappear completely at the autumnal equinox. On the contrary, after the autumnal equinox, extreme days begin to appear near the South Pole, and then the range of extreme days near the South Pole will become larger and larger. (Compile/Liu Lifei)