I think that Mr. Loftus has outdone himself with the Sol charts, and I'm sure they will be useful to a few people writing about those time periods. I was writing something a few months ago, and needed to know the distance between Mars and Pluto circa July 2558, and I wish there had been something like this then. I use a program called Celestia (no relation to the pony) and it's pretty good.

However, I'm a bit unsure why Pluto was left off the charts. I know it's not considered a planet anymore, but it does have a UNSC presence on or around it, including the Democritus RSO and the Kelvington Research Station. Knowing where Pluto is, I think, would be pretty useful.