It seems to me that not being able to PREDICT the position precisely is not the same thing as "it might crash into the Sun!" The universe (God, if you like) knows precisely where the planets are and how fast they're moving within the limits of the Uncertainty Principle, even if WE don't. You can lose a LOT of digits and still be pretty accurate if the starting error is "plus or minus half a Planck length". I get that "past performance is no guarantee of future results" but the fact the planets are still here after 4.5 billion years is a fairly strong indicator that the Earth is probably NOT going to crash into the sun in a hundred million years, even if our math won't let us say that with absolute certainty.