When is the autumnal equinox in 2019? Why are the days shorter and the nights longer during the autumnal equinox?
The Autumnal Equinox is the sixteenth solar term in the twenty-four solar terms and the fourth solar term in autumn. The four words that best describe the weather at this time are "clear and crisp in autumn". So , when is the Autumnal Equinox in 2019 , and why are the days short and the nights long during the Autumnal Equinox? School has started, which also means it is the eighth month of the lunar calendar in 2019, and it is time to put on more clothes. Follow Mr. Shui Mo's website and we will spend a cool autumn with you.When is the autumnal equinox in 2019?According to the calendar, the autumnal equinox in 2019 is September 23 ."Autumnal Equinox" has two meanings: First, the length of day and night is equal. The sun reaches 180 degrees of ecliptic longitude on this day, directly shining on the earth's equator. Therefore, in most parts of the world, the 24 hours of day and night are equally divided, 12 hours each. After the autumnal equinox, the sun's direct point begins to enter the southern hemisphere from the equator, and the days in the northern hemisphere begin to become shorter and the nights longer, with the daytime starting to be shorter than the night within a day. The area near the North Pole is also about to usher in six consecutive months of long nights and six consecutive months of everlasting starry skies in the year. Second, the climate changes from hot to cool. According to the ancient Chinese seasonal division method that uses the Beginning of Spring, Beginning of Summer, Beginning of Autumn and Beginning of Winter as the beginning of the four seasons, the Autumnal Equinox is located in the middle of the 90 days of autumn, dividing the autumn season equally. Why are the days shorter and the nights longer during the Autumnal Equinox?Reason: On the winter solstice, the sun is directly above the Tropic of Capricorn, and the daytime is the shortest in all parts of the Northern Hemisphere. Then the sun's direct point begins to move northward, and the daytime becomes longer and longer in all parts of the Northern Hemisphere. After the vernal equinox, the sun's direct point moves to the Northern Hemisphere, and the days in the Northern Hemisphere begin to be longer than the nights. On the summer solstice, the sun is directly above the Tropic of Cancer, and the daytime is longest throughout the Northern Hemisphere. Then, the sun's direct point begins to move south, and the daytime becomes shorter and shorter throughout the Northern Hemisphere. After the autumnal equinox, the sun's direct point moves to the southern hemisphere, and the days in the northern hemisphere begin to become shorter than the nights.Spring Equinox—March 21 Summer Solstice—6/22 Autumnal Equinox—9/23 Winter Solstice—December 22 By analogy, the days in the northern hemisphere become longer from the winter solstice, but from the vernal equinox the days are longer than the nights; the days become shorter from the summer solstice, but from the autumnal equinox the days are shorter than the nights. Different people have different destinies. As the saying goes, "A good fate is not as good as good luck." We cannot change our destiny, but we can change our fortune. Want to know your fortune in 2019? Then click on the [Premium Calculation] below to find out! |
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