Parallax, or: How Far Away Stuff Is!

I've mentioned parallax in a number of posts, including How Do We Know How Far Away the Planets Are, How Do We Find Out Distances to the Stars, and What is a Parsec? The Royal Observatory in Greenwich have produced a video that illustrates really intuitively what the effect of parallax is and how to use it to calculate distances. Here it is, for your viewing pleasure:

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