1. The Starry Night angular separation control was designed with a
mouse in mind, so if you have a mouse you can plug during use of
Starry Night, that would be optimal.

2. When you have the arrow on your object press down on the very
bottom left corner of the Mac trackpad using your index finger. While
pressing down on the corner take your middle finger and swipe/drag
down, top to bottom, or swipe/drag away from just above your index
finder. Its not easy. You will probably have to try a few times until
you *hit* it.

3.  For angular separation, the trick is to put the very tip of the
arrow on top of the object. So, if selecting a star, make the tip of
the arrow just cover the star. Then try the finger swiping.