An interesting thought just popped into mind.

The current going theory regarding the origin of the Moon appears to be
the Orpheus theory, in which a planetoid nearly the size of the Earth at
the time, impacted Earth and caused a ring of debris that later formed
the Moon.

What just popped into mind is this question: Wouldn't such an extreme
collision be likely to substantially purturb the Earth's orbit into
something substantially non-circular? Even if it wasn't circular
before, it seems unlikely that that impact would produce such a
nearly-circular orbit like we have now. Wouldn't it seem more likely
that it accreded into a nearly-circular orbit and stayed there?

Just a thought...