See list belowJAN 09 196868-FM-T-1FM/Deputy ChiefLunar landing lighting constraint change
1. I have been delinquent and I apologize for not sending this note around sooner. About a month ago I learned in a discussion with Joe Loftus that it is his recommendation, apparently based on considerable analysis and review, that the acceptable sun-angle-at-lunar-landing boundaries should be revised. As I understand it, the old sun eleva- tion angle at the landing point limits were between �° and 20° in order to reduce the possibility of lighting washout. He is recommend- ing that this be changed to between �� and 1�°. I do now know the status of this, that is, whether action has been taken to make these values official or not.
2. If you are interested I recommend you get in touch with Joe Loftus. You have probably already heard this, but—just in case!