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Not much information about this story, read in the 60s or 70s in an English-language anthology. Humanoid aliens having superior technology take over the Earth, and people mostly buckle under peacefully. No one knows where the aliens came from. At the end, humans stage a successful coup, capture the space fleet, and threaten retribution on the aliens' home world. When the alien chief smugly tells his captors that they'll never learn where it is, the coup leader says it's Sigma Draconis. The alien is shocked to hear this and demands to know how they found out. It turns out that over the past twenty or so years, humans pointed out one star after another to members of the invasion force, who were always happy to say, "No, that's not our star," and Sigma Draconis was determined by a process of elimination.
Sigma Draconis is a 4.7-magnitude star, only 19 light-years distant from Earth, so it makes a plausible home for alien civilizations. But it's arguable that aliens are unlikely even to learn the terrestrial names for stars.