> Alain wrote:
>
>> Normaly, when you have binary systems like that, you expect the two to
>> have parallel axis. After all, they where formed at the same time,

>
> True, but the alignment wouldn't be exact as they get pummeled by
> collisions in the early stages and there are also other effects such
> as precession.
Statisticaly, the colisions on both planets would be the same, the shift 
would be less than a few second arc, maybe less than 1 second. That's 
not perceptible as it's only shift the axis by something like 1 to 4 km 
at most.
As for precession, it only causes a wobble, and will affect both planets 
equaly.
>
>> They would very probably be tidaly locked as such a close proximity.
>
> Yes. Interesting point, I never thought about whether tidal locking
> changes the axis of rotation in addition to just slowing it down.
Tidal lock makes the axis parallel.
>
>> Looking at the rings, they are not perfectly edge on to the sun, just
>> a few day before or after the equinox.
>
> You're right.
>

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