Stargate address

Addresses are the symbols needed to establish a wormhole with the Stargate. Stargate addresses within a galaxy are composed of seven symbols: six constellations representing a point in space, while the seventh represents the point of origin.

Because of stellar drift, Dial Home Devices contain automatic update transcievers which allow for new locations to be fixed. However, as the DHD and Stargate were discovered separately, the Tau'ri had no way to account for the 10,000 year old address left by the Goa'uld. Stargate Command was able to over come this with a supercomputer that located the new addresses, turning out two or three every month.

It is possible to establish extragalactic wormholes, but this requires an eighth additional constellation.