Why was the ancient death penalty executed at a quarter of noon? When was that?

Noon: The ancient timekeeping method divided a day and a night into twelve hours, from 11: 00 a.m. to 1: 00 p.m., which also means around noon. At 3: 30 noon, the sun hangs in the middle of the sky, which is the shortest shadow on the ground. At that time, in people's eyes, "Yang" was the peak in a day. In ancient China, people thought killing people was a "dirty thing". No matter whether the murdered person deserves it or not, his ghost will always haunt the judge who sentenced him, the official who supervised the execution, the executioner who executed him and those related to his execution. Therefore, the execution of the death penalty at the peak of Yang Can will inhibit the appearance of ghosts. This should be the main reason why the ancients used to execute at "three noon". At 3 noon, it's almost noon 12. At this time, the sun is the strongest and people's shadows are the shortest. According to superstition, the yin qi of killing people at this time can be diluted by strong yang, which is the spirit. This should be the main reason for the habitual "three-quarter noon" execution. The deep meaning of the execution of "three minutes at noon" may have another meaning. At "three noon", people's energy is the most exhausted, and they are on the edge of "lying on the pillow". Therefore, the prisoner is sleepy at the moment, and the pain may be relieved when his head falls to the ground. In this way, it is considerate of the prisoner to choose such a time to execute the death penalty. The meaning of "3: 00 noon" in ancient novels is "3: 00 noon to 7: 00 noon", which means that at 3: 00 noon (to 15: 00 noon), the yang is extremely strong and the yin is instantly dissipated. This heinous crime should be "not even allowed to do ghosts" to show severe punishment. Yin and Yang experts say that Yang is the most abundant, which is different from modern astronomy. Not at noon, but at three o'clock. In ancient times, beheading was carried out in different periods, that is, beheading was important. Generally, beheading is to operate at noon and let it have a ghost to do; Repeater or heinous criminals must choose the operation at 3: 30 noon, and don't let it be a ghost. The meridian gate of the imperial city is also the most prosperous, regardless of time, so the emperor ordered the people who started the meridian gate to behead, and no ghosts did it.