how do i calculate this?

I have looked but can't find a thing about the scenario below.

This is not for a class of any sort but a matter of curiosity.

Assuming the the earth's coordinates in the universe are at

x1 y1 z1 and t=the present. x,y, and z deltas are measured in any
conveniant
unit of measurement.

Taking into account all motion including expansion of the universe, motion
of
the galaxy, rotation of the earth around the sun, etc. Where was the earth
a
year ago? A hundred years ago? Is there a formula to determine where the
earth was in the universe? This is all relative to where the earth is at
this moment in time.

I hope this is clear.

If I could come up with an estimate maybe that would be sufficient. If
one could say for example that the earth 100 years ago was about n
miles "that way" while pointing to a given star might be a good start. If I
can get close then maybe I can hone in on the specifics later.

thanks much

pierce
.

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