cultureulterior comments on Harry Potter and the Methods of Rationality discussion thread, part 15, chapter 84 - Less Wrong
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My non-conclusive arguments for this are as follows:
The length of an earth day is part of all Earth life experience, not uniquely human.
Hm. If we were using physics here, I'd observe that a usable time turner has to be tied into things like the rotation and movement of the earth, because traveling back in time without taking those things into account somehow leaves one stranded in interplanetary or interstellar space. Given that we're talking magic, well, who knows. But sure, I agree that it's suggestive but inconclusive.
A good bit off topic but replying here anyway. If humanity was not special enough to set the Interdict of Merlin on absolutely everybody it could really turn against them when the aliens arrive.
Are we certain that the amount of time that each rotation takes you actually is an equinoctal hour, or a constant? If broomsticks can use Aristotlean physics, maybe Time Turners can be limited to six solar hours.