逢着天门 Does anyone know the meaning of this saying or idiom? It is part of the commentary to a Shenshu verse, which doesn't really make sense to me, but it seems this expression more or less explains the verse.
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web search：http://blog.sina.cn/dpool/blog/s/blog_5607e12b0100ar1k.html esp. 光有地理位置还不够，还必须掌握时间，才能组成一个有效的时空坐标（space-time coordinates），逢着天门，就是指时间而言，让我们看奇门遁甲，上怎么说。 奇门遁甲 bkrs：the art of becoming invisible -- Daoist magic
逢着during the time.,天门a mythical occasion similar to "constellations arrangement". So逢着天门simply meanduring specific constellations arrangement. – mootmoot Jan 9 at 12:07