World events tend to provide especially clear examples of astrological patterns. The chart for a declaration of war, an economic crash or a terrorist attack will normally contain fewer variables and mixed signals than natal astrology. This is because an individual person is generally a combination of a wide variety of personality traits and influences that manifest over many decades, but (for example) the morning of September 11, 2001 in New York City is primarily a snapshot of a single major occurrence.
While viewing the chart for the recent Paris terrorist attacks* (on November 13, 2015), I noticed an aspect of less than three degrees between Mars and the nodes (i.e. Rahu and Ketu)**. The September 11, 2001 chart, analyzed in this post, includes an aspect of less than one degree between Mars and the nodes.
Since I wondered how consistent this sort of placement was in the charts of major terrorist attacks, I looked up the July 7, 2005 London attacks, as well. The day of the London attacks included Mars aspecting the nodes by less than one-and-a-half degrees. To put this information in context, an aspect of three degrees or less between Mars and the nodes only occurs for an average of less than two weeks per year.