Location. On the forehead, directly above the pupil when the eyes look straight ahead, 1 cun above the anterior hairline.
The name means facing the sun, and the point is on the front of the head. It is a point outside the fourteen channels, on the forehead above the pupil and just inside the hairline. Published sources differ on the detail of the location, chiefly over whether the measurement is taken from the hairline or from the eyebrow, and the hairline itself recedes with age, so the site is better understood as a small area on the upper forehead than as one exact spot. Later literature discusses the point in the context of headache, dizziness and the nose. Its classical record is thinner than for the channel points on the forehead such as GV24 or GB14, its reported effects are not established by modern research, and this entry makes no claim of benefit.
定位。在头前额部，目正视时瞳孔直上，前发际上 1 寸。
穴名取「当阳」之义，位于头之前部。为十四经之外的奇穴，在前额瞳孔直上、发际之内。各家对本穴的定位细节略有出入，主要在于从前发际量起还是自眉量起；且发际随年龄而后退，故宜作前额上部的一小片区域看，而非一个精确点。后世文献多在头痛、眩晕与鼻的语境下讨论本穴。其古典记载较前额的神庭（GV24）、阳白（GB14）等经穴为少，所述作用未经现代研究证实，本条不作疗效陈述。
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