To understand midpoints one needs to see what they are. Figure 1 shows how a midpoint is formed by two planets. In this example we’re considering the midpoint of Chiron and Pluto. It is easy to see that it is at a point half-way between these two planets. Also note that midpoints occur in both the longitudes and the declinations/latitudes.
Figure 1. Midpoints of Chiron/Pluto (indicated by "kp" in the chart) lie midway between the two planets; Chiron
An interesting feature of midpoints is what the Magi Society calls midpoint equivalence; midpoints behave like planets in that they can form aspects with planets or other midpoints.
There are two midpoints that are equidistant to both planets and we usually use the one that is closest to the planets. The two equidistant midpoints are opposite each other and are projected to each other’s position so that they are equivalent.
Certain midpoints are considered to be very important and these midpoints are called the crucial midpoints. These include: Jupiter/Chiron, Jupiter/Saturn, Saturn/Chiron, Saturn/Sedna, Saturn/Uranus, Saturn/Neptune, Saturn/Pluto, Jupiter/Sedna, Jupiter/Uranus, Jupiter/Neptune and Jupiter/Pluto.
Midpoint Crossings and Magi Quads
The aspects of midpoints (to planets and other midpoints) are important and very useful in chart analyses. Aspects to planets are called midpoint crossing (or MDXs) and aspects to other midpoints are called Magi Quads (or M/Qs).
Remember that the more planets are involved in a synchronisation, the more important it is. Midpoint crossings are synchronisations of three planets and Magi quads involve four planets. This often makes them more important than aspects involving only two planets.
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