Some years ago I remember aimlessly browsing Wikipedia late at night and stumbling upon the decision of a consortium of muslim scientists and priests on what direction to pray to in case you're in space. The conclusion: just make a guess.
But what if you're in a very low earth orbit and it constantly moves?
Or you're on Alpha Centauri and relativity takes effect? Do you aim for where the earth is now in the earth's time frame or where the earth is now in your time frame?
Or you're on a distant planet some billion light years away, with the entire relative velocity (including angular) of your position to mecca's position greater than the speed of light?
What if the sun destroys the earth? What if the sun is slingshotted out of the solar system and another star takes its place?
What if the earth/sun get destroyed by a black hole and don't exist and yet they exist to external observers.
What if the mecca/you are in an unstable orbit on the event horizon of a black hole?
What if the mecca/you are in an unstable curled orbit on the inside of a black hole? Technically its a different universe since there's a discontinuity on the event horizon.
What if you're in a really really messy region of spacetime which has a non-zero curl?
What if the universe is hyperbolic (sum of angles in a 3-dimensional triangle < 180 degrees)?
What if the universe is hyperbolic and there's a big crunch event?
What if the universe is closed (sum of angles > 180 degrees) and the energy of this universe is spread out thin enough to become less significant than the vacuum expectation value?
What if during the big crunch event you're in an unstable orbit on the inside of a black hole?
What if the universe is flat and eventually a Boltzmann brain gets formed where you are part of the mecca and the mecca is part of you?
What if during the big crunch event you somehow escape this universe and wait long enough for entropy uncertainty to trigger another big bang?
What if one of the million multiverse theories is true and there are many meccas?
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