A market can square price to time in several different ways. Price units in a trend equal time units in a trend. Base price equals time units to a new change in trend. Prior price range equals times units to a new change in trend. Prior time units equals next price range to a new change in trend.
Current price equals time units from a prior change in trend.
If you study Figure 5 carefully you will see an example of each of the methods Gann used to determine when a change in trend could eventuate.