Along with the Signs and Houses of the Zodiac, the Aspects are key to our interpretation of a horoscope.
Aspects address the angular relationship between planets and points in the Zodiac.
Taking this a step further, if Mercury is at 1 degree Libra in the above horoscope, it will find itself 180 degrees away from Venus, or in a direct opposition aspect to that planet. Squares and oppositions are also known as hard Aspects in that the energy from these Aspects generally represents challenges to be overcome or a balance that needs to be found. Sextiles and trines are considered soft Aspects in that their energy is generally harmonious and beneficent. The energy resulting from a conjunction can be either positive or negative, depending on the planets involved and other Aspects, and factors, in the horoscope. Other minor Aspects are addressed only if their angle is very precise.