Always a pleasure to learn new things.
I'm making theories from what I saw and almost remember.
Err... ok.
Now, I don't know if I agree with the four points only thing.
But there are too much things to say about that and I guess a there's debate already running somehwere about that.
Now, about the stellar drift.
If the drift is proportionate (homothetical ? sp ?), the distance between the points will for sure increase, but the cross point of the three lines will still be the same. But now, I'm not an astrophysic junkie and don't really know if the stars are following some focused lines.
But anyway, I tihnk that the symbols are almost nothing more than a name.
In fact, from what I've read and saw, Daneil's interpratation of the stargate system, though near as logical, could fairly be wrong.
I mean than in fact the stargates were given names made of six constellations that surrounded the planet where they were put, and the seventh sysmbol would be more an identification and almost secure-key symbol.
But hey ! If the symbols seen on most of the gates are in fact constellations that were seen from the Earth, that would mean the gates were first conceived on the Tau'ri homeworld and only then assembled and transported elsewhere !
And except few exceptions were some of the symbols were constellations seen from other places and added after on the other gates, most of them were intended to be used to travel to Earth.
Err...
Time for spoilers...
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The rumors says that the base of the incoming spin-off which is called
Stargate : Atlantis will explain that the Ancients were from Earth.
Somehow, this would fix some issues.
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But anyway, I think the constellations as coordinates sucks.
I think these so-called coordinates are basically no more no less than references.