Opposite your star (本命的殺)Compass termsNine Star Ki 九星気学

本命的殺 is directly opposite where your birth star sits. It and 本命殺 are two ends of one pairing rather than two independent rules — a point most simplified accounts drop.

Oppositions in this system come in pairs: Five Yellow with Dark Sword, and your own star with its opposite. The difference is that the first pair is the same for everybody and the second is yours alone. So the dial carries two layers at once: one the year hands to everyone, one that belongs only to you.

The use of this rule is that it separates the personal from the public. The same bearing can carry completely different advice for you and for someone else — which is why copying another person's direction chart is pointless. Their chart is missing your layer.