dietz.usc-cse@UDel-Relay (12/30/82)
I doubt you could sail from LEO. The drag on the sail from the upper atmosphere would probably overwhelm light pressure. Sails are probably restricted to very high orbits, at least around planets with atmospheres. I've also heard that the L4 and L5 points are not the best, energetically. It's hard to get to them from the moon and from them to geosynchronous orbit.