Earth's axis tilted, which way? Supposedly, Earth was tilted on its axis during Second Impact, causing a change in climate in various parts of the world. This is implied at least twice: 1) In a news broadcast in Episode 02: Natsuko Shinohara (weather girl): "We have hot days all year now, but Japan once had four seasons: spring, summer, fall and winter."
2) In the "Hakone conversation" in Episode 21:
Fuyutsuki: "The same weather day after day... The disappearance of autumn from this country is sad beyond words."

So, Japan appears to have gone from a temperate climate to something warmer. What sort of axis shift would cause this? Basically, do we have enough information to estimate the current positioning of the axis, as well as what effects that would have on other parts of the world? This involves a knowledge set I just don't have.