Light travelling from stars and galaxies takes some time to reach us here on Earth - when we observe stars or galaxies in the night sky, we see their positions as they were when the light left on its journey towards us, and not their current actual positions where they are located now.
Now the visible stars are located at a range of distances from us - from Proxima Centauri at 4.24 light years away, to V762 Cas in Cassiopeia at 16,308 light-years away.
So when we look up, we see Proxima Centauri at the position it was located 4.24 years ago, and in the same view of the night sky, we would see V762 Cas at the position it was located 16,308 years ago.
So not only are we looking into the past, but more than that:
- we are not looking at a snapshot of a single moment somewhere in the past,
- but a composite view of a range of past times, stretching back some 16 thousand years.
So here is my question:
Does anyone know of any resource that:
- shows the positions of stars as we would look up to see them in their current visible positions
- and then allows a "play forward the motions of the individual stars", over the time it took for the light from each one to reach us
- to show where they are located in their current actual positions
I've done quite a bit of searching, but all I can find are maps which show the night sky:
- with a view of the stars, in their visible positions, as we would see them all currently
- with a view of the stars, in their visible positions, as we would see them all at some date in the past
but nothing that would move each star individually according to:
- the motion of the star's orbit, relative to our position as observers on Earth, as we orbit the Sun and as our solar system orbits the Milky Way
- across the elapsed time it took for the light to leave the star and journey to reach us
EDIT: To add some clarity.
A computer simulation is what I am ideally looking for.
Preferably one that would do some sort of "time based animation" to show the relative movements of the individual stars, and showing the final positions of where they are currently actually located.