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In order to understand and visualize the spherical geometry of how a horoscope is constructed, we need to begin with some basic terms.

The sun sign is the sign of the zodiac in which the sun is located for the native. This is the single astrological fact that is familiar to almost everyone. As a very rough rule of thumb, if an event takes place at 6:00 a.m. its ascendant and sun sign will be the same; other rising signs can then be estimated at two hour intervals from there.

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.