From my early school days.
I believe John Gann said:
Above the 45 and bias is up?
Below 45 and the bias is down?
But John Gann used too many different angles. Some of his charts were all lines? ?
John and William didn't seem to see eye to eye very much.
Not my cup of tee.
Simple trend line drawn from right to left is probably better for the short term trader?
As far as angles. Gann probably used the planetary angles the most.
But one has to use what they know and can use best!