Ninth position is almost an afterthought. The first two slots overlap with familiar position VII, the fourth slot has notes exactly an octave above the open strings (so names should be familiar) and the third slot is empty (the eleventh fret only has sharps and flats). Position IX does have two extension notes, however, that you'll need to remember (high C and middle F).
Find position IX “with ease” using “first finger E on third string”. On a classical guitar, your hand will also be touching the body where it joins the neck. The double bar line below marks the 12th fret.
Scale 17. Dorian mode fits well in ninth position.
Scale 18. On a Dorian theme.
The boxes below automatically keep track of which exercises you've seen in this group (you get a white star for each exercise you visit). And clicking on a box will take you to that exercise (you can see the exercise number by hovering over a box and looking at the url displayed). So all this lets you pick up where you left off in your last session, or go on to some random exercise you haven't seen yet. Courtesy of your browser history.