In Taoism, the seven-star conjunction refers to the phenomenon that Jin Mu is in the midst of fire, water and earth, and Uranus and Neptune are in a line along the ecliptic, which is a rare astronomical spectacle that has appeared many times throughout the ages.
Another way of saying this is that any seven planets in the solar system are connected by an opening angle of no more than 3, which can be called seven-star renju, and it does not specifically refer to which seven planets.