From what I recall, NASA planned the lunar landing times so that the sun would be roughly 10-12 degrees above the horizon. This made sure there were shadows visible to provide the astronauts with some visual contour data.
As to the degree of problem this will cause on the future missions as claimed above? I don't see it. We managed to land just fine 6 times, and I'm sure 13 would have landed fine as well, without any issues. Why those problems would suddenly crop up when our technology and knowledge is even greater I don't know. Those NASA guys are pretty smart, heck they can send out a probe on a 7 year mission, for millions and millions of kilometers, make it pass within 236 kilometers of a comet at 14,000 miles per hour, and then return that probe to earth to look at what it caught. I think they'll figure out the moon phase issues
