After The Martian Mark Watney got rescued and returned to Earth, there is a scene near the end where he sits on a bench and looks at a little plant emerging from the ground to his feet, reminding him of the plants he had to grow himself on his exile. Then he stands up and goes to lecture to some NASA students while the screen reads "Day 1", in contrast to all the "Sol X" we saw on Mars.

However, this was clearly not Mark's first day on Earth, seeing that he would have to go through serious medical and public treatment after his return and not just start a new job as a perfectly healthy NASA lecturer right away. It is thus unclear as to what that "Day 1" actually applies to exactly. Is it related somehow to the plant he sees growing (seems unlikely, as the "Sol X"s weren't related just to the plants either)? Is it just his new job at NASA (which would seem a bit superficial to me)? Or was it merely left as "Day 1" instead of, say, "Day 34" to keep the emotional impact of the 1, willingly ignoring the question of some reasonable counting base? Has there been any comment on this or at least some reasonable deduction based on the movie or on evidence that eluded me? Or does the novel maybe even give some hints where the movie doesn't?

  • Wasn't it SOL1 of the new mission? I seem to remember them launching. Commented Mar 29, 2017 at 19:29

2 Answers 2


I interpreted it as the first day for Mark in his new mission of training future astronauts. This also has nice symmetry with the Sol count, since Sol 1 was the first day on Mars and therefore the start of the Mark's mission on Mars.

I think this ties in nicely with the new plant because it is basically a new beginning/phase/chapter in Mark's life. Also the plant is a kind of bridge between Mars and Mark's new job. On Mars Mark had to use his knowledge, including botany, to survive. Based on what I recall of Mark's speech to the trainee's, Mark's new job/mission was to teach them how to survive.

In the current version of the book, with Matt Damon on the cover, the story ends when Mark enters Hermes. I've heard that an earlier version of the book has some scenes on Earth, but I didn't read it so I can't say if there's an answer there.

  • 2
    To add to this, Day and Sol are distinct units of measurement, as Martian days are approximately 2.7% longer than Earth days. en.wikipedia.org/wiki/Timekeeping_on_Mars#Time_of_day
    – MattD
    Commented Oct 19, 2015 at 1:11
  • @MattD Sure, that knowledge was supposed to be implied in the question.
    – Napoleon Wilson
    Commented Oct 19, 2015 at 9:09
  • @Erik I don't know, is there? It's your answer, you know best when it is fully fleshed out. It seems quite complete and coherent to its explanations.
    – Napoleon Wilson
    Commented Dec 4, 2015 at 15:57
  • 1
    Well, it is not a question with a 100% clear-cut answer (yet). I'm looking for everything possible, including (but not exclusively) harder sources. There's no problem with leaving questions unaccepted for months or years, especially when one isn't 99% sure of an answer yet. Afterall, I haven't even rewatched the film yet. So yeah, the answer is fine, as expressed by an upvote, but it doesn't feel correct and definite enough for accepting it for now.
    – Napoleon Wilson
    Commented Dec 4, 2015 at 16:04

It's a little open to interpretation, but I took it to be somewhat different than Erik did: it's Day 1 for this new class of would-be astronauts.

Mark's graying hair and easy comfortable presence int he class seemed to be meant to imply that he'd been teaching classes for quite some time by this point, but for these new hopefuls, this is Day 1 of their journey.

  • 1
    Hmm, that interpretation suffers a bit from the fact that it was presented when Mark was standing/walking alone outside and this scene as well as the movie concentrated largely on him. But still interesting approach.
    – Napoleon Wilson
    Commented Oct 19, 2015 at 16:55
  • @NapoleonWilson that's a good point; I think I'll have to see it again to make sure I'm not misreading it.
    – Liesmith
    Commented Oct 21, 2015 at 0:10
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    @NapoleonWilson I can see this interpretation working, especially because on the first day of class he does his "Yes that was really me, yes I really did..." speech, which felt like something he had developed because he knew what questions would be asked of him. This implies some experience (though there is no guarantee that his experience was from teaching alone).
    – Mark
    Commented Oct 26, 2015 at 14:50

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