The S&P 500 closed the day down 1.89%, which puts it below its 50-day moving average for the first time since October 1, 2010. The index is 91.4% above the March 9 2009 closing low, which puts it 17.3% below the nominal all-time high of October 2007.
For a better sense of how these declines figure into a larger historical context, here's a long-term view of secular bull and bear markets in the S&P Composite since 1871.
For a bit of international flavor, here's a chart series that includes an overlay of the S&P 500, the Dow Crash of 1929 and Great Depression, and the so-called L-shaped "recovery" of the Nikkei 225. I update these weekly.These charts are not intended as a forecast but rather as a way to study the current market in relation to historic market cycles.