Which BL point is midway between Wěizhōng BL-40 and Kūnlún BL-60?

Which BL point is midway between Wěizhōng BL-40 and Kūnlún BL-60?

• A. BL 56
• B. BL 60
• C. BL 57
• D. BL 58

Answer: (D)

Understanding how to locate a midpoint along a meridian helps you see why BL-58 is the answer. On the Bladder channel in the leg, the segment from the knee (BL-40) to the ankle (BL-60) spans roughly a 14-cun length. The point that sits 7 cun above the ankle lies exactly halfway up toward the knee. That location corresponds to BL-58, which is defined as about 7 cun above BL-60. So BL-58 sits midway between BL-40 and BL-60 along the bladder channel. The other nearby points lie closer to either end of the segment and are not at the halfway point.

Understanding how to locate a midpoint along a meridian helps you see why BL-58 is the answer. On the Bladder channel in the leg, the segment from the knee (BL-40) to the ankle (BL-60) spans roughly a 14-cun length. The point that sits 7 cun above the ankle lies exactly halfway up toward the knee. That location corresponds to BL-58, which is defined as about 7 cun above BL-60. So BL-58 sits midway between BL-40 and BL-60 along the bladder channel. The other nearby points lie closer to either end of the segment and are not at the halfway point.