[editor-surveyor]

> “why do you assume that the “original” axial tilt was 0?”

.
They don’t have any idea what they are saying.

If the tilt were anything different than what it is, life would be impossible. There would be a constant wind blowing from west to east (opposite to the apparent sun motion)

[MrB]

Have you read “Privileged Planet”?

There’s also an abbreviated DVD version.