Astrology birth charts

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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 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.

The plane of the equator is defined by the earth's equator.