Are day and night equal during the vernal and autumnal equinoxes? After the Spring Equinox, do the days become longer and the nights shorter, or do the days become shorter and the nights longer?
Both the vernal equinox and the autumnal equinox are one of the 24 solar terms. So, let’s take a look at whether the day and night are equal on the vernal equinox and the autumnal equinox? The second month of the lunar calendar in 2021 is very different from previous years. It is full of various setbacks and battles. Friends who need to check their fortunes, don’t forget to pay attention to Mr. Shui Mo’s website in time!Are day and night equal during the vernal and autumnal equinoxes?Yes, the spring and autumn equinoxes are days when day and night are equal.The so-called equinox means that the day and night are of equal length. It does not mean that the day is longer than the night, nor that the night is longer than the day. Because the sun is directly above the equator during the vernal and autumnal equinoxes, the length of day and night is almost the same during the vernal and autumnal equinoxes. From an astronomical point of view, there are two natural intersection points between the intersection line of the Earth's orbital plane around the sun and the celestial sphere - the ecliptic (that is, the orbit of the sun as seen from the earth), and the intersection line of the Earth's equatorial plane and the celestial sphere - the celestial equator, which are the starting points connecting the 24 solar terms - the "vernal equinox" and the "autumnal equinox". When the apparent sun moves to these two points, the duration of day and night on Earth is equal. Because on this day, the sun's rays are directly on the equator, both the Southern and Northern Hemispheres are equally illuminated by the sun, so the day and night on Earth are equal, both lasting 12 hours. Therefore, on the day of the vernal equinox and the autumnal equinox, the day and night are equal. After the Spring Equinox, do the days become longer and the nights shorter, or do the days become shorter and the nights longer?After the spring equinox, the days begin to get longer and the nights shorter.On the day of the spring equinox, the sun shines directly on the earth's equator. The seasons in the northern and southern hemispheres are opposite. In the northern hemisphere, it is the spring equinox, and in the southern hemisphere, it is the autumnal equinox. At the North and South Poles, on the day of the vernal equinox, the sun stays above the horizon all day. After that, as the sun's direct point continues to move northward, a six-month polar day begins near the North Pole and gradually expands in range; a six-month polar night begins near the South Pole and gradually expands in range. It is worth noting that the days in the northern hemisphere become longer from the winter solstice, but the days become longer than the nights from the vernal equinox. From the summer solstice onwards the days get shorter, but from the autumnal equinox onwards the days are shorter than the nights. When is the Spring Equinox in 2021?The Spring Equinox in 2021 is on March 20, 2021. The exact time of the Spring Equinox in 2021 is: 17:37:19.Although we generally see the solar terms marked on a certain date on the calendar, if we study it carefully, we need to be detailed to the minute and second, because the 24 solar terms are divided according to the position of the sun on the tropical ecliptic. The ecliptic is the path produced by the earth's revolution around the sun. Since the earth is elliptical, its movement trajectory changes, and the time of each year is not fixed, so we must pay attention to the specific time point. |
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