Astronomy for Astrologers
The Bi-Wheel
Here is a typical bi-wheel chart, with the natal chart on
the inside and the transiting planets on the outside.
Here we are using the heliocentric natal chart of my
birth as an example. Note that on the outer ring of
transiting planets we have only drawn in the planet
symbol, the sign the planet is in, and the degrees. We
have left out the minutes, as they tend to clutter up the
chart too much. This is the usual method of displaying
transits—not showing the minutes.
As you can see by looking at any of the transiting
planets (outer ring), you can note where they are today
in relationship to the natal or birth chart. For example,
we can see at a glance that transiting Mars is about to
conjoin (make a conjunction aspect) with my natal Pluto.
Or, we can note that transiting Neptune is forming a
waning square with my natal Saturn. In fact, we could
note all kinds of aspects. That is what a transit to natal