The four planetary configurations shown here are combinations of the major aspects, representing a powerful energy force which can be beneficial or detrimental according to the aspects concerned.
The T-Square
This is the most common of the four configurations, and involves a combination of two squares and one opposition. The two planets which form the opposition are both square to the third planet which forms a T-shape.
Because both aspects are stressful, the T-square can be highly complex in its expression according to the signs and houses it occupies. This can cause tension and stress, lack of confidence, hostility, and disharmony. The subject must work hard to turn into this configuration into something harmonious and positive, but it is possible.
The Grand Trine
This configuration is more beneficial in its effects, but less common than the T-square. It involves a combination of three trines, usually placed in the same element. It can give creativity and good fortune - the reward of well used talents from past lifetimes. The downside of this configuration is that because there is no challenge to accomplish good results, apathy or acceptance can take place, weakening the otherwise plentiful effects of this configuration.
The Grand Cross
This is an extremely powerful, rare configuration of four planets in a combination of four squares and two oppositions. It forms the shape of a cross and those who possess it have a cross, or many crosses, to bear within their lifetime. Six difficult aspects brought together in one major aspect are almost undefeatable and although subjects try hard to structure their lives positively, they usually fail as the strength of the configuration overwhelms them. They tend to repeat the same mistakes again and again, and may become highly stressed, aggressive, fixated or depressed, depending on the planets, signs, and houses involved. However, they can accomplish anything if they learn to exploit the immense powers of this configuration.
The Yod
This configuration is also known as the Finger of God or Finger of Fate. It is another rare combination which consists of two quincunxes and one sextile to form the shape of a pointing finger. The benefits of the sextile aspect are merged into the energies of the two quincunxes with the focal planet placed at the point. This planet is particularly significant because it represents the culmination of talent which is attainable when the hardships of the quincunxes have been channeled into positive creativity. This configuration is usually hard to handle during childhood but can develop into a resourceful influence in later years. It is often found in the charts of highly developed or spiritual individuals.