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The chart thus begins with a framework of 12 equal houses. On this is superimposed the signs. In an equal house system the cusp between any two houses will fall at the corresponding point for each of the signs. Thus for a native whose ascendant is at 12? of Leo, the beginning of the second house will be at 12? of Virgo, of the third at 12? Libra, and so on. In other systems of houses which take into consideration the effects of the angle of intersection between the planes of the horizon and the ecliptic, the calculations will not be that simple. For these calculations it is essential to know the latitude of the event. Tables are available for these calculations, and more recently computer programs have been written to do this. Very often these programs allows the user to choose from a variety of house systems. The most commonly used house system is the Placidus system.

The ascendant is the eastern point where the ecliptic and horizon intersect. Its opposite point in the west is the descendant.In draughting a horoscope the ascendant is traditionally placed as the left-most point of the chart. In the course of a day, because of the earth's rotation, the entire circle of the ecliptic will pass through the ascendant and it will be advanced by about 1?. This provides us with the term rising sign, which is the sign of the zodiac appearing on the native's ascendant.

Most astrologers use the tropical zodiac in which the astrological year begins with the vernal equinox when the sun moves into the earth's northern hemisphere. This point is set at 0? of the sign Aries. This is a matter of some dispute with those who would favor the sidereal zodiac that takes into account the precession of the equinoxes. Because of a "wobble" in the earth's axis of rotation over a period of about 26000 years the point at which the vernal equinox advances in the sky by about 50 seconds of arc every year. Advocates of a sidereal zodiac believe that the position of the signs should be fixed relative to the constellations.