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Using an ephemeris and a table of houses an astrologer calculates relative positions of the sun, the moon, and the planets for specific time and place in order to erect a horoscope. This diagram, called a chart is a stylized map of the heavens. The sun or the earth is placed in the centre (depending on whether the ephemeris was heliocentric or geocentric) with the remaining elements around the outside: the planets, the lunar nodes, the ascendant and midheaven, and the houses. Then the angles between the planets are designated. These angles are the astrological aspects. Different systems of tri-secting arcs produce houses of different size. The calculation of a horoscope is a complex but purely technical skill normally carried out by computer software such as Astrolabe, Kepler, WinStar or ZET. There are websites which offer automated online astrology services too, such as Astro.com.

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.