Parallax
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Parallax movement is relatively easy to detect using photography. Pairs of simulated images*, taken six months apart, are shown here as examples. Examine them by clicking the links. Notice that the nearby star is easy to spot when the images are blinked.
Source: Parallax Lab at University of Washington
*Actual stars also have proper motions. The images used here deliberately omit it.
Star A
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[Side by Side] [Blinked Pair]