Hike into main area of the Lower Satellites by following the signs to the Third Flatiron. Fifty yards after walking between the A-7 and BBC Boulders, look up to your right off the trail for a tall boulder. Unlike so many other problems in the Satellites, this one is not a lowball.
Dark Side of the Moon starts on the south face next to a relatively blank right-facing dihedral that goes up about 10 or 12 feet to a tiny little roof. Start just right of the dihedral on decent edges and do a long reach to one of several obvious holds in and around around the roof section. From there, pull the roof bulge and go at least 10 more feet to the top using edges and slots.