This was an incrediblely interesting presentation about a topic not often discussed in amatuer astronomy circles.  These grazing lunar occultations occur when the very edge of our moon passes in front of a star.  The result is that the mountainous terrain of the Moon causes the star to disappear and reappearing several times.  Because of the exacting geometery required for this to happen, a particular grazing lunar occultation can only be see from a very narrow path on earth.  In fact observers even 100 feet away from each other will have different views of the occultation.

Mark also shared some very informative links:

Mark also shared a video of a recent Grazing Lunar Occultation:

The planning process for observing a grazing lunar occulation is quite extensive and requires a far amount of time.  Maybe RAC can get together a bunch of observers and imagers to go after the next grazing lunar occultation in our area.