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Unknowns comments on Harry Potter and the Methods of Rationality discussion thread, March 2015, chapter 119 - Less Wrong Discussion
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Fair point; I didn't think of that. Does anyone know of a unit of time in which the equivalent of 3:54 would be a Schelling point of some sort?
Time Turners use units of one hour, so at least some kinds of magical items use our units.
Can you use the time turner in different increments, and possibly with a different maximum, if you fully understand hours are arbitrary? This sounds exactly like partial transfiguration.
(Alternatively, you go back some fixed amount of time for every grain of time sand in the turner, and you could build one of other increments by using a different quantity of sand.)
How does Time Turner select reference frame? What if you use it in the orbit, will you see Earth rotational angle jump by 90°? Assuming the reference frame is fixed to Earth surface, going sufficiently far away will give you FTL which can be used to create arbitrarily long time loops. Assuming it is not, what happens if you are moving at relativistic speeds (relative to Earth) and use the Time Turner?
EDIT: We not even need to consider relativity - what if you are flying on a broomstick (constant speed) or on a moving train and use Time Turner? This experiment is simple enough and can reveal a lot.
DO NOT MESS WITH TIME. Obviously if you attempt to use it in the stated way something very bad will happen.