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A nearby star's apparent movement against the background of more distant stars as the Earth revolves around the Sun is referred to as parallax.
Definition of parallax, a method used to measure the distance to stars.
Interactive site showing users the concept of parallax - the idea of seeing the same image from different views.
Simulations of star systems: stellar parallax and binary stars.
Great explaining on how we measure distances to stars using parallax and distances to galaxies using Cepheid Variables stars.