Simple

On a one person scale the distance through which Ryu tried to meditate was always moving. Depending on how much he tried to observe at once, he would be moving his observations relative to space, and thus experience distortion.

On a planetary scale, worlds were constantly moving in relation to one another, shifting and moving themselves through space. Even if by some miracle Ryu managed to nail down the parameters of his observation, it wouldn't matter because the very land he was standing "still" upon was moving.

On a solar system scale… on a galaxy level scale… on a universe's scale… Everything was constantly moving through space.

Time was even more obvious. Even if Ryu sat still for the whole of his life, time would continue to move. Even after he died, it would continue to move. It was the most relentless force in all existence, it stopped for no one, and even after the whole world had died and all beings ceased to be, it would continue to move forward.