The Past

Here's a couple of astro charts for some past major highs and lows.

If you are completely new to this just note that blue is good (120, 60 deg) and red is bad (180, 135, 90, 45).

First up is the 3rd of September 1929 Dow bubble high. It's fairly non-descript and doesn't have many clues for a very major high. Perhaps Jupiter (positive) in Gemini passing over the 8 degree point (at bottom of chart) had a significant influence here.

Next the 1932 low. Again there isn't anything much that leaps of the page at you. Mars (negative) has taken the place of Jupiter in Gemini. But not much else is obvious.

The big thing that you can't see is what happened in between these two charts though. I've highlighted Saturn, Uranus and Jupiter because even though they aren't in aspect to each other at that point they spent the best part of 1930 and 1931 forming hard oppositions and squares to each other.

This is something that was known well in advance by competent astrologers and was part of the basis for Gann to forecast the 1930's bear market when he was writing Tunnel ten or fifteen years earlier.

Next up is the 1987 top. No annotation needed here... Look at all the blue!!

Then just a couple of months later at the bottom of the 1987 crash the sky looks like this:
(Note in particular the Lunar Node opposition to Mars and both of them square to Neptune)

 In more recent times we have the 2000 high. Lots of red lines going on here but note that the Lunar Node is in Leo, at the top of the 18.6 year business cycle.

Then the 2002 low. Again this is not a very intuitive chart. The stand out to me though is the Luner Node opposition to Pluto and also Saturn has only recently passed a conjunction/opposition to both.

At the 2007 high... A lot more blue going on.

 But a short time later in 2009 the blue is gone and there's just the big opposition between Saturn and Uranus left. This aspect was almost there in 2007 but Uranus brings 'sudden change', which the GFC did in spades.