Simply put, the short-term low point of BTC should be at the Si hour on the Si day of the Si year (Si fourth sound) Considering the global time difference and the influence of true solar time, the UTC+8 in the East Pacific region and the UTC -8 in the West Pacific region have an error time of approximately plus or minus 16 hours Low points are usually tested once or twice for bottoms, and early put options sold in these two days should be the highest price point and the most profitable