What are the rules of werewolf transformation?
It can’t be that you transform when the full moon rises, because the geometry works out that the full moon rises exactly as the sun sets; you don’t see too many stories with werewolves running around while it’s still light out.
Does the curse only take effect when the subject sees the full moon? A lot of movies imply that this is how it works, with the transformation only occurring after the clouds part dramatically, but this also can’t be right because then the subject would be able to avoid the curse by just staying inside all night. Just close the curtains and you’re fine.
And there’s no set rule for when the curse is lifted; again, the full moon sets when the sun rises, so does the subject stay transformed until dawn? Like, the sky is getting light, the world is waking up, people are getting ready for work, someone’s dad goes on a morning jog to watch the sunrise, and there’s just a werewolf in the backyard?
There has to be a window for the transformation, it has to take effect only at night, but even that is subjective. That depends on your latitude, your altitude, and what time of year it is. There’s no hard border between day and night, just a subtle gradient; day, civil twilight, nautical twilight, astronomical twilight, then night proper (and the reverse for daybreak).
Lycanthropy is part of old European folklore, with some origins pointing even as far back as Ancient Rome (Romulus and Remus were raised by wolves), so it stands to reason that the curse isn’t backed by hard science but folk wisdom/intuition. My theory is that whichever entity cast the curse made an arbitrary decision, like it takes effect when the moon is highest in the sky (around midnight-ish), and ends around the start of twilight just as the sky is getting lighter. Subjects suffer, on average, about five hours of actual lycanthropy each month. It’s definitely not the 12-hour curse some people think it is; that said, as a European curse, it is important to remember that the more north you go, the longer nights are during winter, and the shorter they are during summer.