The Earth moves around its orbit, as it moves around it's orbit the stars appear to move.
This affect is called parallax.
The closer the star, the greater the affect.
We can use the parallax angle to measure the distance to stars.
If the parallax angle is one second of an arc, we say it is one parsec.
1 parcec is approximately 3.26 light years.
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The closer the star to us, the greater the effect is
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