Intersection between horizon and ecliptic gives us two ecliptic points that are Ascendant (Eastern horizon) and Descendant (Western horizon). Intersection between meridian and ecliptic gives us two ecliptic points that are Mid Heaven (Upper Meridian) and the Lower Meridian. Zodiac is so divided in four parts, which are in turn divided in three parts, making twelve divisions, the same number that the zodiac signs number. Each one of the twelve divisions is a house. The precise way the division is made relies on the house division method chosen.