Every 2 hours or so, a new sign of the Zodiac is busy by ASC and, similarly, the other points (DISC, MC, IC). During this rotation the horizon is continually crossed by two points representing the lifting and the lowering of the Sun The ASC indicates precisely, for a given day at a given place, the sunrise, the sunset and the DISC. Among them are placed in the highest point of the meridian, noon (MC), and the lowest point midnight (IC). These positions correspond to the cardinal points of a paper astronomical, which are reversed compared to those of a map of the Earth. Those born at dawn will the Sun near the Ascendant, those born at noon will be close to the Sun MC, those born at sunset will have it next to the DISC and those born at midnight will have it close to the IC. The intermediate spaces between the four points correspond to other times of day.
As well as the line ASC-DISC divides the zodiac into two semicircles, one upper and one lower, also the line MC-IC divides it into two equal semicircles, one right and one left of the meridian.
In the past, the design of the horoscope has assumed different geometric shapes, including square. The latter follows from the definition of the ancient "four quadrants" to indicate what are now the four semicircles. The distribution of the planets in semicircles has special meanings.

• All or almost all of the planets are located in the upper semicircle, above the horizon. The subject exists as a function of the outside world. So a certain superficiality, extraversion, need to live with others, aversion to loneliness. The spiritual life may be limited. They are likely to insecurity and difficulties in the action. Whatever activity is being undertaken with the second order to get noticed. The presence of some planet in a strong position below the horizon can mitigate these features. The same thing applies to the following cases.

• All or almost all the planets are in the bottom half, below the horizon. The inner life is very intense. The subject is closely related immediate environment. Nature spiritual, contemplative, they tend to activities carried out in silence ability to empathize with others.

• All or almost all of the planets are located in the eastern part, to the left of the meridian. It is a favorable position which gives a good balance inducing also a great activity. Orients the individual to autonomy, but with a tinge of selfishness, narcissism and intolerance for the links too protracted.

• All or almost all of the planets are located in the western part, the right of the meridian. Characterized by a strong liabilities with significant dependence on others. A certain imbalance determines intimate little individualism, and sometimes a sign of indifference to the facts of life, even personal ones.
Angolante. When a planet is located not more than 8 ° dall'ASC away from DISC, MC and by the CI, it is said angular and its negative or positive effects on the subject are strengthened.
Clusters or stellium. It may happen that the planets are variously piled into a point of the horoscope. If one of the planets is the Sun, this placement will accentuate the positive or negative sign, depending on the overall look of the theme. However clutter creates an imbalance for the excessive proximity of influences. We will then disharmony of nature, and life can be discontinuous, with remarkable achievements sometimes and sometimes poor. In any case, however, the cluster of planets is a sure sign of highly specialized professions, although there is the risk of living and thinking only within the limits of its business.
• If the planets are largely gathered near the Ascendant, we find ourselves in front of an active, exuberant, but also aggressive, arrogant and proud.

• If the planets are largely gathered close to the MC and one of them is located near the Ascendant, it is individuals who strive for success, but it is also possible that this comes without too much commitment.
• If the planets gathered in large part by the DISC, and one of them is the ASC, these are people who reject the principles and mindset of the established order, and they are also fighting against their own interest.
• If the planets are largely gathered near the IC, the examinee will be a contemplative, rather complexed and repressed. Prefer the solitude and "refuge" of their environment. It may, however, achieve equally important works.
• If the planets are divided into two equal groups and opposites, one MC and one to the IC, we are faced with a very ambitious person, but success will come only after harsh struggles, because these individuals are likely to see the world view to projects conflicting, and therefore difficult to achieve.