Twenty-four seasons of the origin of the autumnal equinox and climate characteristics
The origin of the autumnal equinox "Doo refers to himself as the autumnal equinox, the northern and southern hemispheres day and night are divided, and the appropriate half of the fall, so the name is also." The sun's yellow longitude is 180 degrees, the solar calendar time for September 22 to 24 each year. According to the old calendar, the autumnal equinox happens to be the midpoint of the ninety days of autumn. Just like the vernal equinox, the sun shines almost directly on the equator, and the length of day and night time is once again equal, so it can be said that the autumnal equinox is a rather special day. From this day onwards, the position of direct sunlight continues to shift from the equator to the southern hemisphere, and the northern hemisphere begins to have shorter days and longer nights. The Spring and Autumn Annals recorded: "The autumnal equinox is the halfway point between yin and yang, so the days and nights are even and the cold and heat are equal." In astronomy, the autumnal equinox is taken as the end of summer and the beginning of fall.
Every year around September 23, when the sun reaches 180 degrees of the yellow longitude, the "Autumn Equinox" festival. The "Autumn Equinox", like the "Spring Equinox", was the earliest festival established by the ancients. According to the "spring and autumn flourish dew - yin and yang in and out of the upper and lower chapters" cloud: "autumn equinox, yin and yang are also accompanied by, so the day and night are even and cold and heat." "Autumn Equinox" means two things: First, according to China's ancient to spring, summer, autumn, winter as the beginning of the division of the four seasons, the autumnal equinox resides in the 90 days of autumn, the equal division of the autumn season. The second is that at this time of day 24 hours day and night are divided, each 12 hours. This day with the "equinox" day, the "autumnal equinox" day, the sun almost direct sunlight on the equator, after this day, direct sunlight position southward, the northern hemisphere, the day is shorter than the night is longer.
The Autumn Equinox is one of the twenty-four traditional Chinese solar terms, and is celebrated on September 23rd or 24th each year, when the sun reaches 180 degrees of the yellow meridian. The meaning of the autumnal equinox "moon order seventy-two wait collection": "August in the middle ...... solution to see the spring equinox". "Points" is the meaning of day and night, the same as the equinox, the sunlight on this day directly on the Earth's equator, day and night are equal. Since then, the position of direct sunlight more southward, the northern hemisphere tends to short days and long nights, the temperature is lower, in the country has universal significance.
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