1.5 cun lateral to the anterior midline and 2.5 cun within the anterior hairline.
On the other hand, this point is at the medial third and lateral two-thirds of the distance from anterior midline to the line vertically from Touwei ST-8.
Chengguang BL-6 is also 1.5 cun posterior to Wuchu BL-5.
How to locate
First locate the midpoint of the anterior hairline and Baihui DU-20 on the vertex. The distance between these two point is 5 cun.
Chengguang BL-6 is in the midpoint of these two reference points and also 1.5 cun lateral to the anterior midline.