by about 1°. In an astrological chart, the ascendant progresses and changes zodiac signs roughly every two hours (give or take), advancing about one degree every five minutes. This movement provides us with the term “rising” sign, which is the sign of the zodiac “rising” over the eastern horizon at the moment of birth. This point is thought to affect how we are perceived by others, based on the zodiac sign on the ascendant at the time of birth. The point on the ecliptic that is 90° above the plane of the horizon at the time is called the Midheaven, or Medium Coeli (MC), placed at the "twelve o'clock position" effectively where the Sun would be if the birth time was midday. This area is thought to have greatest significance on one’s career and public image. The Zodiac The Zodiac, or "circle of animals" is a zone or belt in space projected onto the celestial sphere through which, from our viewpoint, the planets move. A symbolic geometric construction around 16 degrees wide, it is divided into 12 signs, each of 30 degrees longitude (making 360 degrees, a full circle), with the ecliptic, the apparent path of the Sun, as its middle line. The tropical zodiac used by most Western astrologers has its beginning at the exact moment that the Sun crosses the celestial equator and enters the zodiacal sign of Aries. Some Western astrologers use the sidereal zodiac favored by Indian ("Jyotish") astrologers, which is based more closely on actual positions of constellations in the heavens, as opposed to the tropical zodiac, which is a moveable format based on the seasons. The tropical zodiac defines the vernal point (the first day of spring in the northern hemisphere) as the first degree of Aries, but the sidereal zodiac allows it to precess. Many people are confused regarding the difference between the sidereal zodiac and the tropical zodiac signs. Because of a "wobble" in the Earth's axis of rotation over a period of about 26,000 years (often called a "great year"), the rate at which the vernal equinox precesses in the heavens is approximately 0 deg, 0 min, 50.23 seconds a year, drifting by one degree every 72 years. Precession of the equinoxes thus occurs at a rate of roughly 5 arc minutes of a degree every 6 years. The tropical signs relate to the seasons and not the stars. Here is