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Quoting "Mark J. Reed" <[log in to unmask]>:

> On Wed, Jan 21, 2004 at 10:41:14PM -0600, Nik Taylor wrote:
> > Which is an illogical question.  Directions like north, south, east, and
> > west are planetary conventions, and the only logical way to assign
> > "east" is "the direction the sun rises", and work out the other
> > directions accordingly.
>
> Not necessarily.  There is also a solar-system-wide "north", which
> points out of the plane of the ecliptic in the same direction as the
> Earth's North pole.  If you use that as a basis, a couple planets rotate
> east-to-west instead of west-to-east.

Which in turn is commonly avoided by saying they've got axial tilts of over 90
degrees.

                                                         Andreas