> Thomas de Groot wrote:
>> I have not looked at your code, but isn't it true that the *whole* 
>> saturnian system is tilted? I am almost sure the problem comes from 
>> the order in which you do the transformations. What I mean is that 
>> when applying the tilt, this should be done to a union of Saturn + 
>> rings + satellite. So, you have first to make your satellite orbit 
>> around  the planet without the tilt (and at the origin), and only at 
>> the end tilt the complete saturnian system (and translate it where it 
>> has to go). That way you are sure the satellite remains in its correct 
>> orbit.
> 
> Principally, you're right... but then, almost all moons' orbits are also 
> more or less tilted against Saturn's equatorial plane, and although 
> Wikipedia gives no data about the ascending nodes of these orbits, it's 

> would be easiest to calculate). So also with the union method, I would 
> sooner or later (when refining my Solar System gradually) face the same 
> problem - but then at least one step less to calculate!
> 
> See you in Khyberspace!
> 
> Yadgar

With Saturn sitting at the origin:
Use a 'Y' rotation to move the moon about it's orbit.
Use a 'X' rotation for the tilt plus a 'Y' rotation to shift the nodes.

Then, translate Saturn to it's orbit, and rotate it around to make it 
travel along it.


Alain

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