How the planets relate to each other is shown by the aspects they form. Angles between planets reflect attitudes and the energy patterns they have toward each other. They are like force fields that mark turns in consciousness.
Aspects bring out facets, sides of the self and character traits.
The first twelve aspects correspond to the numbers one through twelve, the twelve signs of the Zodiac as well as many other twelve-fold things. The trine also resonates with the third sign of the Zodiac, Gemini, and with the Planet Mercury. A conjunction is measured from plus or minus zero degrees, in other words right next to each other. When planets are conjunct they can unite efforts and combine forces. Conjunct planets are at the alpha omega point where cycles begin and end.