Stargate SG-1, Season 1 Episode 1, "Children of the Gods"
CARTER: Abydos is probably the closest planet in the network to Earth. I mean the closer they are, the less the difference in relative position due to expansion—the further away, the greater the difference. In a few thousand more years, it won't work between Earth and Abydos either.
DANIEL: Unless you can adjust for the displacement.
CARTER: Right, now with this map as a base, that should be easy. All we have to do is correct for Doppler's Shift. Then I should be able to arrive at a computer model that can predict the adjustments necessary to get the 'gate working again.
KAWALSKY: Okay, so what did we just figure out?
CARTER: Any civilization advanced enough to build this 'gate network would be able to compensate for 50,000 years of stellar drift.