The Natal Chart is made up of all the Planets, the Sun, the Moon, the Rising Sign and the Midheaven. The placements of these components are recorded on the Wheel of 12 Houses. The Rising Sign or Ascendant is the constellation that was on the Eastern horizon at the time of your birth and determines the beginning of the first house. The other 11 houses are placed anticlockwise around the wheel.
Each planet has a relationship to the other heavenly bodies in your natal chart.
These relationships are measured in angles and degrees and are termed ASPECTS. Symbols are used to denote the relationship. Each planet and sign is said to 'Rule' a particular house.