WHAT IS A PROGRESSION?

Secondary progressions are a tool that aid astrologers in making predictions. Many astrologers don't use them because very little information is available.

The theory is that for every year you are old, the chart is moved forward that many days -- usually by using a computer. However if you know what an ephemeris is (there is one on Astro.com) you can use that and just count forward from your birthdate as many days as you are old in years. It's called a day-for-a-year. Why does it work? No one knows, but it does.

I use a tri-wheel, putting the natal in the center, the transits in the middle and the progressed in the outer wheel so I can see the angles the planets make to each other.

Then you read the progressions like you read transits, but opposite because the generational (slow) planets are important in transits -- the personal planets move too fast.

In progressions it's the personal planets (the first five sometimes including Jupiter and Saturn if they have changed signs from their natal sign) that are important because the outer (slow) planets won't move out of sign or much at all for that matter -- though can happen.

The Moon is the fastest progressed planet aspecting for approximately three months so it is considered a timer and not a planet that causes events. It is important what sign and house it is in -- which is true for the other planets as well.

Also, progressed planets can aspect each other and some of the slow moving planets in transit (Pluto, Uranus, Neptune).

For further clarification, there is a great definition of secondary progressions in the Wikipedia.