[Jacquerie]

Market Timing has repeatedly been proved (vitually) impossible.

Timing to the day? Not me.

To the month? Maybe.

To the quarter? Most definitely yes and it can make or break a retirement.

[Uncle Miltie]

Accurately market timing the days is critical to a market timer:

"if you took away the 10 best days, two-thirds of the cumulative gains produced by the Dow over the past 109 years would disappear. Conversely, had you sidestepped the market's 10 worst days, you would have tripled the actual return of the Dow."

http://online.wsj.com/article/SB123275782424412007.html

THE INTELLIGENT INVESTORJANUARY 24, 2009.Why Market Forecasts Keep Missing the Mark By JASON ZWEIG.