By using a global positioning system GPS or any of us who have a GPS navigator can orient themselves in places that even do not know physically. But someone asked how to orient themselves GPS satellites?, Because for the GPS function you must know the orbital position of the GPS satellites with sufficient accuracy. But what "benchmarks" used by these satellites and we now know that even the farthest stars in the Milky Way have a proper motion can not use them as fixed points of reference. For astronomers it a little more than four years began to make a map ICRF2 using the "exact" of 3000 quasars, which to be "fixed points" as far as lights are able to show an unchanged position in the sky during the course of several years. In short, we could say that thanks to distant galaxies, active and bright we can reach your destination when we're lost, that is, both yesterday and today the sky and its celestial bodies have been our guides.
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