Among them, the most important factor is the change of light position caused by the rotation and revolution of the earth. If the east-west direction is set, the athletes and spectators in the sports factory will be dazzled by the direct sunlight, which will affect the athletes' play and the audience's viewing experience.
Revolution factor of earth rotation
The rotation and revolution of the earth form the change of four seasons and the alternation of day and night. Because the earth rotates from west to east, the sun we usually see rises and sets in the west. Walking eastward in the morning, people's eyes are vulnerable to direct sunlight and they can't open their eyes. If the temperature is higher, they will be more dizzy. Walking west in the afternoon, people's eyes are also vulnerable to direct sunlight, which affects their eyesight.
If the sports ground sets the track in the east-west direction, it will have a long-term impact on athletes' eyesight, whether in the morning or afternoon, and affect their performance; If the runway is set in the north-south direction, most of the direct sunlight will be blocked, and most of the time the sunlight will come in from the side, which will have much less influence on the athletes.
Factors of Reasonable Arrangement of Audience Seats
More audience seats can be set in the east-west direction of the North-South Stadium. Because people's line of sight is relatively balanced, they are less exposed to sunlight from east to west, so the seats in the east-west direction can better watch the game, and the viewing effect is much better than that in the north-south direction.
Geomagnetic field factor
Electric current exists in any living thing, and so does human beings. According to the principle of electromagnetic induction, current will produce a magnetic field. When the magnetic field generated by human current cuts with the earth's magnetic field, it will generate a force, which will negatively interfere with the athletes who are doing strenuous exercise and affect their performance. Therefore, the length of the north-south runway will be much longer than that of the east-west runway in the sports field, so as to eliminate this influence and let athletes play their own level better.