Technical Analysts typically use a chart to project *future*...

Technical Analysts typically use a chart to project *future* prices.

If charts can predict the *future*, shouldnt they also be able to *predict the past*.
Why dont Technical Analysts use charts to tell us where prices have come from ?
Project to the left !
After all a chart is a chart and the planetary alignments are the same in both cases.

The major advantage of using charts to *predict* the past is that it can be tested.
If a chartist discovers that he cannot predict the past with any statistical significance, they can ditch the charts and start learning proper investment methods.
And who can argue with that ?