Wouldn't Sheppard not arrive in Atlantis in the future since there would be major stellar drift after 48000 years? This was not mentioned in the episode so I guess the writers forgot about this problem. According to Sam, stellar drift takes place every few hundred years. This problem at first is why none of the addresses would work that Daniel tried from Abydos. It also means that Sheppard could not go anywhere other than Atlantis even if he could because all of the addresses would have changed.
Vala,
Vala,
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