The following details the differences between the two factions.
The first school can be called Zishi School. The ancients said that life is the beginning of a day, from 23:00 to 00:59. Therefore, the Zishi school thinks that 23:00 pm is the beginning of the next day, so it will change the solar column to the solar column of the next day.
The second school can be called morning and evening school. This school thinks that the dividing point of two days is 0:00, not 23:00, which comes from the physical basis of the earth's rotation around the sun. Therefore, the period from 23: 00 to 23: 59 on the same day is still the same day, or the solar column is used, but this period is called midnight, the main branch of midnight, and midnight the next day. After a period of time from 0: 00 a.m. to 0: 59 a.m., it was already noon the next day, which was the so-called brunch, but the sun column had to be used the next day.
Therefore, the biggest difference between the two factions is that in the hour of midnight, the solar columns used will be different. If the heavenly stems in these two days happen to be the same five elements, such as A and B, there must be a difference, but it may not be too big, but if the heavenly stems in these two days are just different, such as B and C, the whole fate will be very different.
The reason why there is such an argument may be that there are different calendar differences in different periods in ancient times, and the ancient sages have not done any research and explanation on this, which has caused the dispute between the two schools today. I believe there will be no definite answer for a long time to come.
However, fortune telling does not need to be assigned anything else, as long as it is accurate. So, as long as you are willing to do more verification and find enough life cases born at midnight, you will know which one is correct.