this post was submitted on 13 Mar 2025
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I know we're in a meme community but this did get me thinking... Not only is the Earth spinning but it's also in an orbit around the Sun which is also orbiting around the center of the Milky Way which is moving through space relative to other galaxies and so on.
Do we have enough information to calculate a position in space in the future for Earth without a fixed reference other than current point?
That's what einstein said. There is no fixed reference frame, but only relative ones. Every "inertial"(meaning, motion without any external force) frame of reference is equally valid as any other inertial frame movibg with respect to it.
But for sure we can tell earth's orbit is not inertial since circular motion occur, which is due to external force of gravity.
Edit:typo
Shouldn't it be (at least theoretically) possible to find some sort of geometric center where - on average - the rest of the universe is expanding away from?
It's not, because the space itself is expanding