Anna - if Jupiter and Saturn are only aligned once every 25 years, then Earle would still have had to wait, not for Cooper, but because he knows that this is the only time that the doors to the lodge are open, unless he is an inhabiting spirit like BOB or Mike, It is the only time BOB can come out except at night, etc, this has also been discussed before..
Also I think if some of you newer members read the Project Red Room at the top you will understand more about this there are lots of very good theories and discussions in there. :)
ooh! and I also don't think it was possible for anybody to give Cooper anymore clues that it was a map, because he didn't know and nor did he. Earle was the only one who knew, and because he was Coopers enemy and already had access to the lodge, then it makes sense to me that why would he tell Coop how and when to get in, it would only foil his plans and Coop would probably beat him to the punch, he may not have managed to kidnap Annie, etc etc so there are loads of reasons for him not to do that.
When you think about it though, he did get plenty of clues in a way, the giant, the dwarf, the smell of the engine oil, etc etc,...so you would think he would recognise those symbols when he was examining the "puzzle" in the office.
Btw Gordon sorry I didn't answer your question in the other thread re this: I think Laura met James at 9.15 pm rather than 9.30, but doesn't Sara say 2she came home from Bobby's at/around 9", then when she goes upstairs, the phone rings, she says to James "I'll meet you in 15 minutes" then the bike pulls up, etc, so I'd assume it was 9.15..
"watch out for my cousin.."
