I have never once seen constellations used to refer to astronomy more than just knowing which is which xD
But yea the stars don't look hugely different now to what they did then in terms of the light reaching us, whats different is most likely our atmosphere is thicker/more polluted because in cosmic terms, a few thousand years is nothing, we shouldn't be seeing different stars.
Constellations are more fun to think about from a history perspective than an astronomy one imo.
- - - Updated - - -
That's cool
- - - Updated - - -
Oh but speaking of Astronomy, this is why it's so cool.
[video=youtube;hgqoB2kk8f8]http://www.youtube.com/watch?v=hgqoB2kk8f8[/vido]