pageloss because holy stuff that's amazing
The first time I landed on Duna (I cheated, though, so it doesn't really count) I saw Ike eclipse the sun.
Still haven't landed legitimately on Duna, even though I've been to Laythe. Said Laythe mission involved sticking a different payload on the Duna rocket, as it was a bit overengineered. Would've landed on Duna, but the game crashed mid-flight.
Said mission was when I decided "forget it" and just started retroburning to hit Duna, efficiency be damned, causing my trajectory to be summed up as "a straight line towards the sun that hits Duna on the way."