Pez Dispens3r wrote:phlip wrote:It's definitely a positional thing, not a directional thing... note that the address of, say, Earth, is the same no matter which gate you're dialling from.
Except we get contradictions of that. The first few SG:1 seasons were driven by the concept of using the Abydos cartocuhe's addresses to visit new planets. Except, the constellations had drifted over time, and to account for that it took time to calculate the new addresses for the same planets. I think there is a throwaway line that calculations will produce one legitimate address every two weeks. Very convenient for episodic formatting.
So, yeah, with constellations drifting, earth's address should be different from each other gate. But, then, each new interplanetary population encountered should speak different languages, and definitely shouldn't speak English, so yeah.
This was explained because the Earth gate didn't have a DHD, which automatically updates the addresses to account for drift.
Basically, the dialed address is like a URL, and the DHD is like the DNS server, the SGC had a list of URLs, but their DNS data was out of date so the IPs connected to those URLs were all invalid.
This could also explain the reason for the difference between the Movie version of how the gates worked and the show version. The gate symbols could have originally been used as navigational symbols (constellations). But over time, it's more convenient to have static addresses than navigationaly useful ones, so the DHD system probably came about as a usability overlay to the old navigational system.
Since the Earth gate didn't have a DHD, they were stuck using the underlying navigational protocols until they found a DHD