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Parallax is the apparent motion of an object based on different lines of sight.

## Calculating ParallaxEdit

In the example to the right, we see that from the movement of the Earth, there has been an angle $\theta$ introduced between where the earth was and where it currently sits.

In this sort of problem, we will primarily be using the fact that :

$tan\theta = \frac {1 AU}{d}$

Therefore, given either $d$ or $\theta$, we can solve for the other. Note that $d$ is the distance from the sun to the object.