It only appeared once in 124 years!

According to the Guangzhou Wuyang Planetarium:

Last year's winter solstice day was December 21

This year's winter solstice is also on December 21

Winter solstice date for two consecutive years

Both are December 21st

This calendar phenomenon is very rare

According to statistics

This strange calendar phenomenon

The last time it appeared in 1896 and 1897

It has been 124 years

Why is this calendar phenomenon?

The main reason is that the length of the current solar calendar is inconsistent with the length of the regression year. The twenty-four solar terms are based on the length of one year of the year of return. The length of one year of the year of return is 365.2422 days. The current date of the solar calendar is a cycle of 4 years (in the range of decades), of which there are three years of days, 365 days per year; there are 366 days of one year (leap years), a total of 1461 days in four years. The length of the 4 years of the regression year is: 365.2422 ×4 = 1460.9688 days. The difference between the two is 0.0312 days. That is, the length of the 4-year solar calendar date is 0.0312 days more than the length of the 4-year return year.

As time goes by, the solar term (winter solstice) date will arrive early. With the postponement of time, the trend of early solar terms (winter solstice) dates is becoming more and more obvious.

According to statistics, from 2056 onwards, for three consecutive years (2056-2058), the winter solstice date is December 21. What is even more unusual is that from 2088 onwards, for 12 consecutive years (2088-2099), the winter solstice date is December 21.

This year's "winter solstice" solar terms occur at 23:59 on December 21, the moment when the sun reaches 270 degrees of ecliptic longitude, and the sun directly hits the Tropic of Cancer. The Northern Hemisphere has the shortest days and the longest nights.

Source 丨China News Network

Edited by Cong Tianyi

Responsible editor 丨 Yan Xinyu

Audit 丨 Wang Jing

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