Werewolves in space ? Easy it's only a matter of gravity !
So during a new moon, the moon is aligned with the sun. Thus the gravity force is in the same direction thus we can add them.
On the opposite, during full moon, the moon is on the other side, so the forces can be subtracted.
We also know that werewolves only appears at night thus, the Earth gravity is aligned with the sun one (same direction).
Thus someone transform into a werewolf if Sum Forces = Gravity Earth + Gravity Sun - Gravity Moon (we'll discard the floor reaction, but obviously it's here)
Now it's only a question of finding this value and you'll only have to have this same force apply to a body to trigger a werewolf in space !