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Longitude is also necessary for determining the position of the ascendant. This is because charts use Local Time. Time zones were developed in the 19th century as a by-product of the development of railways. This permitted train schedules to be written based on the certainty that any two cities in a time zone had the same time. In reality there is an hour of difference between points at the beginning and end of a 15? average time zone. For political reasons the time zones cannot be identical bands. It would not be appropriate for a time zone boundary to cut through the middle of a city. Time zone boundaries were also the subject of political manipulation in the Pacific islands when they sought to be the first places on earth to see the new millennium. Adjustments are therefore made for the difference in one's actual longitude and the longitude of the nominal meridian associated with clock time.

The medium coeli, or mid-heaven, is that point on the ecliptic that is furthest above the plane of the horizon; its opposite point is known as the imum coeli. For events occurring where the planes of the eccliptic and the horizon co-incide the limiting position for these points is at 90? from the 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.

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