合相是一个占星术当中用到的术语。它的含义是：从某个地方（通常是地球）看，天空中的两个天体距离很近，有时也称为天体的碰撞。

合相的符号是 ☌。

合 (天体位置)

Appulse is an astronomical term that refers to the closest approach of one celestial object to another, as seen from a third body. Usually it refers to the close approach of two planets together in the sky, or of the Moon to a star or planet as the Moon follows its monthly orbit around Earth, as seen by an observer located on Earth.