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Li Shimin was not born for a few years, so Yang Jian and the others knew about it. Yang Jian still wanted to wait until Li Shimin was born to get it. The sperm was not his even if it was delayed by one second. How could you let Li Yuan know the time so accurately?

I can't stand it, I feel like the author thinks too well of the ancient emperors. To be honest, let's take the most obvious example, Zhu Yuanzhang. Those who climbed up from the bottom eventually became the emperor who squeezed the bottom the most. The butt determines the head.