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27 June, 13:15

How do astronomers use parallax to calculate a stars distance?

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  1. 27 June, 13:20
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    Astronomers can measure a star's position once, and then again 6 months later and calculate the apparent change in position. The star's apparent motion is called stellar parallax. The distance d is measured in parsecs and the parallax angle p is measured in arc seconds.
  2. 27 June, 13:31
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    Astronomers use an Astrolabe
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