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Astronomical Phenomenon Of Spring Equinox
Mar 20, 2018

On the 20th of the Gregorian calendar around the year, the sun is at the vernal equinox 0° (spring equinox) and is the vernal equinox. On this day, the sun is almost directly in front of the Earth’s equator, and it is almost as long as day and night across the globe (without considering the refraction and morning twilight of the atmosphere on sunlight). After the vernal equinox, the direct sun continues to move from the equator to the northern hemisphere. Regions in the northern hemisphere begin to grow shorter and shorter (days of day and day are longer than nights), and regions around the southern hemisphere begin to grow short (days and days are shorter than nights). Therefore, the vernal equinox is also called a rise.

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In the north and south poles, on the day of the vernal equinox, the sun is on the horizon all day. Since then, as the sun's direct point continues to move northward, the polar region near the North Pole has begun to expand for six months, and the area has gradually expanded; the polar night of six months has begun to grow near the Antarctic.

It is worth noting that: the northern hemisphere began to grow longer and longer from the winter solstice, but the white pheasant began to be longer than the night from the vernal equinox; from the summer solstice, the white pheasants began to get shorter and shorter, but from the autumnal equinox began to be shorter than the night.

The reason is: On the winter solstice, the sun is directly on the Tropic of Capricorn, the shortest daytime is in the northern hemisphere, and then the sun's direct point begins to move northwards, and the daylight in the northern hemisphere is getting longer and longer. After the vernal equinox, the direct point of the sun moved to the northern hemisphere, and the northern hemisphere began to grow longer than the night. On the summer solstice, when the sun was directly on the Tropic of Cancer, the longest part of the northern hemisphere was the white sky, and then the direct point of the sun began to move southwards, and the daylight in the northern hemisphere became shorter and shorter. After the autumn season, the sun's direct point moved to the southern hemisphere, and the northern hemisphere began to be shorter than the night.