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

Calculating ParallaxEdit

Parallax

Here we see an example of a parallax problem setup

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.