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Nope, not visiting that
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That's not really true. First, if you can invent time travel you can probably do the math to calculate positions of objects. Second, even if you do need a beacon, you could use something that already exists. For example, radio waves. Earth has been shooting off radio waves for a fair amount of time now. That could be used as a beacon. Also, you could do something like having your time machine do small jumps, check it's relative position, then adjust. This would solve just about every issue.
So you have no idea how time travel would work but youre certain that traveling through time will be simple heliocentric math and radio waves can be used as a beacon?