The bulk update request #2456 is pending approval.
create alias venus_(planet) -> venus
create alias mars_(planet) -> mars
create implication saturn -> planetary_ring
Reason: Both versions of the venus and mars tags are currently in use, it's a bit silly.
Currently the saturn tag can be used "for planets ... with visible rings around them" despite the fact that the planetary_ring tag has existed for over a decade. Ambiguous situations could occur where an artist draws, for instance, the planet earth with rings around it. In such a situation planetary_ring would be a more appropriate tag since saturn is not featured in the image. Once the implication is in place the saturn tag may simply be removed from images clearly not containing it.