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From what I remember, Apparation can transport you fairly long distances. And if that's too dangerous for unskilled wizards, why don't they just set up a chain of Portkeys?

Edit: I am aware that the full moon happens across all of Earth, but I thought it was only nighttime that werewolves transform.

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    Taking a potion is easier? – Bellerophon Oct 16 '17 at 22:55
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    Werewolves are shunned by wizarding society. Who exactly is going to set up a chain of Portkeys for them? – Anthony Grist Oct 16 '17 at 22:58
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    When the moon is full, it's full for the entire Earth. Unless you expect the werewolves to keep teleporting around so they're always in sunlight away from moonbeams, but then they wouldn't get any sleep. – jwodder Oct 16 '17 at 22:59
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    I think that in light of what @jwodder points out, this is off-topic as a "question seeking scientific explanations"... Since the question is essentially asking why you can't avoid the full moon by traveling around the world. – recognizer Oct 16 '17 at 23:23
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    @ThePyjamasTerror Easy enough to do. And even if it is only one year more it's still pretty impressive what she was able to do because it's noted that Polyjuice Potion is difficult to get right and can go badly wrong; the fact it backfired on her is only because she had the wrong type of hair but I got the impression it's difficult to brew anyway. So what's the difference between a first year and a second year? Probably not much for such an advanced potion! – Pryftan Oct 18 '17 at 16:58
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They would need a network of Portkeys, requiring a lot of inter-Ministry support.

If werewolves were to keep traveling to avoid the nighttime in any country, they'd need a network of Portkeys spanning the entire globe. Setting up such a network would require the cooperation of various Ministries of Magic around the world: it's unlikely that one single Ministry of Magic could set something like this up for the werewolves in their country without the approval of others.

In addition, the Ministry of Magic in Britain is prejudiced against werewolves, so at least as the Ministry is over the course of the series, it's unlikely they'd be willing to make the effort to attempt to set up a global network of Portkeys for werewolves to avoid the nighttime.

Also, it might not work - it's unclear whether werewolves only transform at night.

There isn't anything indicating whether werewolves transform only at night, or if once the moon is full, they remain transformed until the moon begins to wane again. Traveling around the world would only work if the transformation was triggered every night by the sunset and subsequent rising of the moon. If, however, once it's a full moon they remain transformed until the phase of the moon changes, then they'd still transform wherever they are.

Lupin mentions disappearing once a month, but it isn't clear whether his absence during the day is because he's still transformed into a werewolf, or because having transformed the night before left him feeling weak and needing to rest.

What little evidence there is seems to imply that the transformation lasts, night and day, until the moon wanes again.

“As long as I take it in the week preceding the full moon, I keep my mind when I transform … I am able to curl up in my office, a harmless wolf, and wait for the moon to wane again.” - Harry Potter and the Prisoner of Azkaban, Chapter 18 (Moony, Wormtail, Padfoot and Prongs)

In addition, every time Lupin or someone else refers to his transformation, they say it's "once a month", not "nightly", and there doesn't seem to be any evidence he turns back human during the day. He never mentioned doing anything as a human during the day when the moon is full, even in a weakened state.

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When the moon is full, it is full for the entire Earth.

In some places, the full moon is even visible during the day.

No matter where they apparated, they would still be under a full moon.

Of course, it depends on how the full moon thing works; if they transform only at night, then they could go to Antarctica or the Arctic, whichever is currently experiencing 24-hour daylight.

Without more information on how the magic of Werewolves works and what actually causes the transformation, then the answer to your question is: nowhere on Earth is safe.

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    Iirc in the non canon movie Remus didnt transform until the moon was directly visible. – JohnP Oct 17 '17 at 1:12
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    @JohnP Yes but he would still transform inside the shrieking shack, Hogwarts and other buildings such as his house. So as long as the moon is full, they transform – Mikasa Oct 17 '17 at 1:31
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    @MikasaPinata Agreed, but why then does Lupin only transform once the moon appears from behind the clouds? Shouldn't he have transformed the moment the full moon arose over the horizon? Is it the existence of the full moon that transforms them (then they should be transformed all the time, since the moon is full [as in completely there] all the time after all, just not fully visible) or is it the moonlight of the full moon, at which point staying inside, in complete darkness, in a cave or a dungeon should be sufficient to prevent transformation, which most likely isnt the case. – BMWurm Oct 17 '17 at 12:41
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    @BMWurm There are two possible answers to that: 1) the film producers (or whomever decides that) feel the need to change things (often with Riddikulus excuses although sometimes they are valid); or 2) the full moon really only started at that exact moment. Choose your potion. I personally feel it's 1 (and I don't even think the logic behind 2 is valid) but I have a real problem with the way films mutilate stories (not to say I can't enjoy films but I also see the book in my mind when I'm watching it so I just filter). – Pryftan Oct 17 '17 at 23:15
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    @JohnP Yes indeed that's correct. But as you point out it's not canon. And I'll just keep it at that because you say it far nicer than I've ever managed (or at least I usually don't manage?). – Pryftan Oct 17 '17 at 23:18

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